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五年级解方程练习一二

来源:爱go旅游网
解方程练习(一) 用字母表示数

1、判断:a =a2( ). xxx3x( )

2、解决问题:

1)做50件衣服,每件衣服用布b米。当b=2时,用不的总米数是多少米? 2)小亮和小娟同看一本故事书且都看了4天,小亮每天看a页,小娟每天看

b页,那么:ab表示( )。 4a表示( )。 4a-4b表示( )

3)一本书有a页,小明每天看12页,看了b天,用式子表示还没有看的页

数。如果这本书有100页,小明看来8天,用上面的式子求没看的页数。 4)m=5,n是m的4倍,p是n的1.6倍,求4m+6n+10pd 值。 解方程练习二 1、直接写出得数: 2、解方程:

x=8.2 2x-12+3=26

21.3x-18.8x=1 5x-0.5=8 ( x-4.6) 2-1.5x=0 13x-6.8x+x=46.8 2(x-4)=3(x-12) 2、列方程解决问题:

1)粮店运来大米、面粉共3700千克,已知运来的面粉比大米的2倍多100

千克,粮店运来大米、面粉各多少千克?

2)贝贝用绳子来测量课桌的长度,两折来量,绳子比课桌还长0.6米;三折

来量,绳子比桌子短0.1米,绳子长多少米?

2五年级解方程题有答案

÷2

(2)2(X+X+0.5)=9.8 (3)25000+x=6x (4)3200=440+5X+X (5)X-0.8X=6 (6)12x-8x=4.8 (7) 7.5+2X=15 (8)1.2x=81.6

(7)x+5.6=9.4 (10)x-0.7x=3.6 (11)91÷x=1.3 (12) X+8.3=10.7 (13) 15x=3 (14) 3x-8=16 (15) 3x+9=27 (16) 18(x-2)=270 (17) 12x=300-4x

(18) 7x+5.3=7.4 (19) 3x÷5=4.8 (25) 0.5x+8=43 (26) 6x-3x=18 ÷x=0.35

(29) 1.8x=0.972 (30) x÷0.756=90 ×0.4

(32) (27.5-3.5)÷x=4 (33) 9x-40=5 (34) x÷5+9=21 (35) 48-27+5x=31 (36) 10.5+x+21=56 (37) x+2x+18=78 (38) (200-x)÷5=30 (39) (x-140)÷70=4 (40) 20-9x=2 (41) x+19.8=25.8 (42) 5.6x=33.6 (43) 9.8-x=3.8 ÷x=12.6

(45) 5x+12.5=32.3 (46) 5(x+8)=102 (47) x+3x+10=70

(48) 3(x+3)=50-x+3 (49) 5x+15=60 (50) 3.5-5x=2 ×7+4x=12.5

(52) x÷1.5-1.25=0.75 ×6=2.6

(54) 6x+12.8=15.8 (55) 150×2+3x=690 (56) 2x-20=4 (57) 3x+6=18 (58) 2(2.8+x)=10.4 (59) (x-3)÷2=7.5 (60) 13.2x+9x=33.3 (61) 3x=x+100

(62) x+4.8=7.2 (63) 6x+18=48 (64)3(x+2.1)=10.5 (65)12x-9x=8.7 (66)13(x+5)=169 (67) 2x-97=34.2 (68)3.4x-48=26.8 (69)42x+25x=134 (70)1.5(x+1.6)=3.6 (71)2(x-3)=5.8

(72)65x+7=137 (73) 9x+4×2.5=91

(74) 4.2 x+2.5x=134 (75) 10.5x+6.5x=51 (76) 89x-43x=9.2 (77) 5x-45=100 (78) 1.2x-0.5x=6.3 (79) 23.4=2x (80) 4x-x=48.6 (81) 4.5x-x=28 (82)X-5.7=2.15 (83)5X-2X=18 (84)3X+0.7=7 ×2= 4.2+x

(86) 26×1.5= 2x+10 ×16―16×0.2=4x (88) 13 9.25-X=0.403 ÷X=0. 3

(90) 23x=14x+27 (91) x+14x=75 (92)95-5x=80 (93)1.8 +6x=54 (94) 6.7x-60.3=6.7 (95) 9+4x=53

(96) 2x+8=16 (97) 20x-14x=24 (98) x+7x=8 (99) 9x-3x=6 (100) 6x-8=4 (101) 5x+x=9 (102) 8x-8=6x (103) 45x=20 (104) 2x-6=12 (105) 7x+7=14 (106) 6x-6=0 (107) 5x+6=11 (108) 2x-8=10 (109) 2.5x-8=4 (110) x-34=7 (111)3x+7=28 (112) 3x-7=26 (113) 9x-x=16 (114) 24x+x=50 (115) 1.2x-8=4 (116) 3x-8=31 (117) 6x+6=12 (118) 3x-3=3 (119) 5x-3x=4 (120) 2x+16=19 (121) 5x+8=19 (122) 14-6x=8 (123) 15+6x=27 (124) 5-8x=4 (125) 7x+8=15 (126) 9-2x=1 (127) 4+5x=9 (128) 10-x=8 (129) 8x+9=17 (130) 9+6x=15 (131) x+9x=4+7 (132) 2x+9=17 (133) 8-4x=6 (134) 6x-7=28 (135) 7x-9=20 (136) x-56=1 (137) 8-7x=1 (138)x-30=12 (139) 6x-21=21 (140) 6x-3=6 (141) 9x=18 (142) 4x-18=14 (143) 5x+9=11

(144) 17-2x=11 (145) x+4+8=23 (146) 7x-12=9 (148) 5X-2X=18 (149) 3X +0.5=5 ×2= 4 x

(151) 26×1.5= 2x ×16―16×0.1=4x ÷X=0.3 (155) X÷

(156) 93-5x=80 (157) 180-6x=54 (158) 9+4x=40

(159) 0.2x-0.4+0.5=3.7 (160) 9.4x-0.4x=16.2 (161) 92-4x=20 (162) 7x÷ (163) 16x+34x=1 (164) 18x-14x=12

(165) 3 x-42÷14=15 (166) 12+4x=56 (167) 22-14x=12

(168) X+8.3=10.7 (169) 5x =30

(170) x-5.6=9.4 (171) x÷0.8=90

(172) 3x-8=16 (173) 3x+9=27 (174) 5.3+7x=7.4 (175) 3x÷

(176) X-0.8X=6 (177) 12x+8x=4.8

五年级解方程180题答案

÷2 2x÷÷2 (2)2(X+X+0.5)=9.8

4x÷÷4 (3)25000+x=6x 25000+x-x=6x-x

5x=25000 5x÷5=25000÷5 X=5000

(4)3200=440+5X+X 6x+440=3200 6x+450-450=3200-440 6x=2760 6x÷6=2760÷6

X=460

(5)X-0.8X=6 0.2x=6 ÷0.2=6÷

X=30

(6)12x-8x=4.8 4x÷÷4 (7) 7.5+2X=15 2x÷÷2 (8) 1.2x=81.6 ÷÷

X=68

(9) x+5.6=9.4

(178) 7(x-2)=49 (179) 4×8+2x=36 (180) (x-2)÷3=7 (181) x÷5+9=21 (182)(300-x)÷5=30 (183) 91÷x =1.3 (184) 41-3x=17

(10)x-0.7x=3.6 ÷÷

X=12

(11)91÷x=1.3 91÷x××x 1.3x=91 ÷1.3=91÷

X=70

(12) X+8.3=10.7 (13) 15x=3 15x÷15=3÷15 (14) 3x-8=16 3x-8+8=16+8 3x=24 3x÷3=24÷3 X=8 (15) 3x+9=27 3x+9-9=27-9 3x=18 3x÷3=18÷3 3x=6 (16) 18(x-2)=270 18x-36=270 18x-36+36=270+36 18x=306 18x÷18=306÷18 X=17

(17) 12x=300-4x 12x+4x=300-4x+4x 16x=300 16x÷16=300÷16 (18) 7x+5.3=7.4 7x÷÷7 (19) 3x÷5=4.8 3x÷5××5 3x=24 3x÷3=24÷3 X=8 (20) 30÷x+25=85 30÷x+25-25=85-25 30÷x=60 30÷x×x=60×x 30=60x 60x÷60=30÷60 ×8-2x=6

11.2-2x+2x=6+2x 11.2=6+2x

2x÷÷2 ×3=0.06

6x-38.4=0.06 6x÷÷6 X=6.41 (23) 410-3x=170 410-3x+3x=170+3x 170+3x=410 3x+170-170=410-170 3x=240 3x÷3=240÷3 X=80 (24) 3(x+0.5)=21 3x+1.5=21 3x÷÷3 (25) 0.5x+8=43 0.5x+8-8=43-8 0.5x=35 ÷0.5=35÷

X=70 (26) 6x-3x=18 3x=18 3x÷3=18÷3 X=6 7x=42

7x÷7=42÷7 X=6 ÷x=0.35 ÷

(29) 1.8x=0.972 ÷÷

(30) x÷0.756=90 x÷×0.756=90× ×0.4 ÷÷

(32) (27.5-3.5)÷x=4 24÷x=4 x=24÷4 X=6 (33) 9x-40=5 9x-40+40=5+40 9x=45 9x÷9=45÷9 X=5 (34) x÷5+9=21 x÷5+9-9=21-9 x÷5=12 x÷5×5=12×5 X=60 (35) 48-27+5x=31

5x+21-21=31-21 5x=10 5x÷5=10÷5 X=2 (36) 10.5+x+21=56 (37) x+2x+18=78 3x+18-18=78-18 3x=60 3x÷3=60÷3 X=20 (38) (200-x)÷5=30 (200-x)÷5×5=30×5 200-x=150 200-x+x=150+x 150+x=200 X+150-150=200-150 X=50 (39) (x-140)÷70=4 (x-140)÷70×70=4×70 X-140=280

X-140+140=280+140 X=420 (40) 20-9x=2 9x=20-2 9x=18 9x÷9=18÷9 X=2 (41) x+19.8=25.8 X=6 (42) 5.6x=33.6 ÷÷

X=6 (43) 9.8-x=3.8 9.8-x+x=3.8+x X=6 ÷x=12.6 ÷

X=6 (45) 5x+12.5=32.3 5x÷÷5 (46) 5(x+8)=102 5x+40=102 5x+40-40=102-40 5x=62 5x÷5=62÷5 (47) x+3x+10=70 4x+10=70 4x+10-10=70-10 4x=60 4x÷4=60÷4 X=15 (48) 3(x+3)=50-x+3 3x+9=53-x 3x+x+9-9=53-x+x-9 4x=44 4x÷4=44÷4 X=11 (49) 5x+15=60 5x+15-15=60-15 5x=45 5x÷5=45÷5 X=9 (50) 3.5-5x=2 3.5-5x+5x=2+5x 5x÷÷5

×7+4x=12.5 4x÷÷4 (52) x÷1.5-1.25=0.75 x÷

x÷1.5=2 x÷×1.5=2× X=3 ×6=2.6 ×××6

4x÷÷4 (54) 6x+12.8=15.8 6x=3 6x÷6=3÷6 (55) 150×2+3x=690 3x+300=690 3x+300-300=690-300 3x=390 3x÷3=390÷3 X=130 (56) 2x-20=4 2x-20+20=4+20 2x=24 2x÷2=24÷2 X=12 (57) 3x+6=18 3x+6-6=18-6 3x=12 3x÷3=12÷3 X=4

(58) 2(2.8+x)=10.4 2x÷÷2 (59) (x-3)÷2=7.5 (x-3)÷2××2 X-3=15 X=18 (60) 13.2x+9x=33.3 ÷÷

(61) 3x=x+100 3x-x=x-x+100 2x=100 2x÷2=100÷2 X=50 (62) x+4.8=7.2 (63) 6x+18=48 6x+18-18=48-18

6x=30 6x÷6=30÷6 x=5 (64)3(x+2.1)=10.5 3x÷÷3 (65)12x-9x=8.7 3x÷÷3 (66)13(x+5)=169 13x+65=169 13x+65-65=169-65 13x=104 13x÷13=104÷13 X=8 (67) 2x-97=34.2 2x-97+97=34.2+97 2x÷÷2 (68)3.4x-48=26.8 3.4x-48+48=26.8+48 ÷÷

X=22 (69)42x+25x=134 67x=134 67x÷67=134÷67 X=2 (70)1.5(x+1.6)=3.6 ÷÷

X=0.8 (71)2(x-3)=5.8 2x-6+6=5.8+6 2x÷÷2 (72)65x+7=137 65x+7-7=137-7 65x=130 65x÷65=130÷65 X=2 (73) 9x+4×2.5=91 9x+10=91 9x+10-10=91-10 9x=81 9x÷9=81÷9 X=9 (74) 4.2 x+2.5x=134 6.7x=134 ÷6.7=134÷ X=20

(75) 10.5x+6.5x=51 17x=51 17x÷17=51÷17 X=3 (76) 89x-43x=9.2 46x÷÷46 (77) 5x-45=100 5x-45+45=100+45 5x=145 5x÷5=145÷5 X=29 (78) 1.2x-0.5x=6.3 ÷÷

X=9 (79) 23.4=2x 2x÷÷2 (80) 4x-x=48.6 3x÷÷3 (81) 4.5x-x=28 3.5x=28 ÷3.5=28÷ X=8 (82)X-5.7=2.15 (83)5X-2X=18 3x=18 3x÷3=18÷3 X=6 (84)3X+0.7=7 3x÷÷3 ×2= 4.2+x 4.2+x=7 (86) 26×1.5= 2x+10 2x+10=39 2x+10-10=39-10 2x=29 2x÷2=29÷2 ×16―16×0.2=4x 4x÷÷4 (88) 13 9.25-X=0.403 ÷X=0. 3 ÷

X=63 (90) 23x=14x+27 23x-14x=14x-14x+27 9x=27

9x÷9=27÷9 X=3 (91) x+14x=75 15x=75 15x÷15=75÷15 X=5 (92)95-5x=80 95-5x+5x=80+5x 5x+80=95 5x+80-80=95-80 5x=15 X=3 (93)1.8 +6x=54 6x÷÷6 (94) 6.7x-60.3=6.7 6.7x=67 ÷6.7=67÷

X=10 (95) 9+4x=53 4x=53-9 4x=44 4x÷4=44÷4 X=11 (96) 2x+8=16 2x=16-8 2x=8 2x÷2=8÷2 X=4 (97) 20x-14x=24 6x=24 6x÷6=24÷6 X=4 (98) x+7x=8 8x=8 X=1 (99) 9x-3x=6 6x=6 X=1 (100)6x-8=4 6x-8+8=4+8 6x=12 X=2 (101) 5x+x=9 6x=9 6x÷6=9÷6

(102) 8x-8=6x 8x-8+8=6x+8 8x-6x=6x-6x+8 2x=8 2x÷2=8÷2 X=4 (103) 45x=20 4445x÷5=20÷5 X=25 (104) 2x-6=12 2x-6+6=12+6 2x=18 2x÷2=18÷2 X=9 (105) 7x+7=14 7x+7-7=14-7 7x=7 7x÷7=7÷7 X=1 (106) 6x-6=0 6x-6+6=0+6 6x=6 X=1 (107) 5x+6=11 5x+6-6=11-6 5x=5 X=1 (108) 2x-8=10 2x-8+8=10+8 2x=18 X=9 (109) 2.5x-8=4 2.5x-8+8=4+8 2.5x=12 ÷2.5=12÷ (110) x-34=7 X-3334+4=7+4 (111) 3x+7=28 3x+7-7=28-7 3x=21 3x÷3=21÷3 X=7 (112) 3x-7=26 3x-7+7=26+7 3x=33 3x÷3=33÷3 X=11 (113) 9x-x=16 8x=16 8x÷8=16÷8 X=2 (114) 24x+x=50 25x=50 25x÷25=50÷25 X=2

(115) 1.2x-8=4 1.2x-8+8=4+8 1.2x=12 ÷1.2=12÷ X=10 (116) 3x-8=31 3x-8+8=31+8 3x=39 3x÷3=39÷3 X=13 (117) 6x+6=12 6x+6-6=12-6 6x=6 X=1 (118) 3x-3=3 3x-3+3=3+3 3x=6 3x÷3=6÷3 X=2 (119) 5x-3x=4 2x=4 2x÷2=4÷2 X=2 (120) 2x+16=19 2x+16-16=19-16 2x=3 2x÷2=3÷2 (121) 5x+8=19 5x+8-8=19-8 5x=11 5x÷5=11÷5 (122) 14-6x=8

14-6x+6x=8+6x 6x+8-8=14-8 6x=6 X=1 (123) 15+6x=27 6x+15-15=27-15 6x=12 6x÷6=12÷6 X=2 (124) 5-8x=4 5-8x+8x=4+8x 8x+4-4=5-4 8x=1 8x÷8=1÷8 (125) 7x+8=15 7x+8-8=15-8 7x=7 X=1 (126) 9-2x=1 9-2x+2x=1+2x 2x+1-1=9-1 2x=8 2x÷2=8÷2 X=4 (127) 4+5x=9 5x+4-4=9-4 5x=5 X=1 (128) 10-x=8 X=10-8 X=2 (129) 8x+9=17 8x+9-9=17-9 8x=8 X=1 (130) 9+6x=15 6x+9-9=15-9 6x=6 X=1 (131) x+9x=4+7 10x=11 10x÷10=11÷10 (132) 2x+9=17 2x+9-9=17-9 2x=8

2x÷2=8÷2 X=4 (133) 8-4x=6 8-4x+4x=6+4x 4x+6-6=8-6 4x=2 4x÷2=2÷4 (134) 6x-7=28 6x-7+7=28+7 6x=36 6x÷6=36÷6 X=6 (135) 7x-9=20 7x-9+9=8+20 7x=28 7x÷7=28÷7 X=4 (136) x-56=1 X=56+1 X=57 (137) 8-7x=1 8-7x+7x=1+7x 7x+1-1=8-1 7x=7 X=1 (138) x-30=12 X-30+30=12+30 X=42 (139) 6x-21=21 6x-21+21=21+21 6x=42 6x÷6=42÷6 X=7 (140) 6x-3=6 6x-3+3=6+3 6x=9 6x÷6=9÷6 (141) 9x=18 9x÷9=18÷9 X=2 (142) 4x-18=14 4x-18+18=14+18 4x=32 4x÷4=32÷4 X=8

(143) 5x+9=11 5x+9-9=11-9 5x=2 5x÷5=2÷5 (144) 17-2x=11 17-2x+2x=11+2x 2x+11-11=17-11 2x=6 2x÷2=6÷2 X=3 (145) x+4+8=23 X+12=23 X=23-12 X=11 (146) 7x-12=9 7x-12+12=9+12 7x=21 7x÷7=21÷7 X=3 (148) 5X-2X=18 3x=18 3x÷3=18÷3 X=6 (149) 3X +0.5=5 3x÷÷3 ×2= 4 x 4x=7 4x÷4=7÷4 (151) 26×1.5= 2x 2x=39 2x÷2=39÷2 X=18 ×16―16×0.1=4x 4x÷÷4 ÷X=0.3 ÷

X=123 (155) X÷0.5=2.6 ×

(156) 93-5x=80 93-5X+5X=80+5X 5X+80-80=93-80 5X=13 5X÷5=13÷5 (157) 180-6x=54

180-6X+6X=54+6X 6X+54-54=180-54 6X=126 6X÷6=126÷6 X=21 (158) 9+4x=40 4X+9-9=40-9 4X=31 4X÷4=31÷4

(159) 0.2x-0.4+0.5=3.7 ÷÷

X=18 (160) 9.4x-0.4x=16.2 9X÷÷9 (161) 92-4x=20 92-4X+4X=20+4X 4X+20-20=92-20 4X=72 4X÷4=72÷4 (162) X=18 (163) 7x÷ 7x÷6××6 7X÷÷7 (163) 16x+34x=1 50X=1 50X÷50=1÷50 (164) 18x-14x=12 4X=12 4X÷4=12÷4 X=3 (165) 3 x-42÷14=15 3X-3=15 3X-3+3=15+3 3X=18 3X÷3=18÷3 X=6 (166) 12+4x=56 4X+12-12=56-12 4X=44 4X÷4=44÷4 X=11 (167) 22-14x=12 22-14X+14X=12+14X 14X+12-12=54-12 14X=42

14X÷14=42÷14

X=3

(168) X+8.3=10.7 (169) 5x =30

5X÷5=30÷5 X=6

(170) x-5.6=9.4 X=15

(171) x÷0.8=90 ×90

X=72

(172) 3x-8=16

3X-8+8=16+8 3X=24 3X÷3=24÷3 X=8

(173) 3x+9=27

3X+9-9=27-9 3X=18 3X÷3=18÷3 X=6

(174) 5.3+7x=7.4

7X÷÷7 (175) 3x÷ ×5

3X=24 3X÷3=24÷3 X=8

(176) X-0.8X=6

0.2X=6 ÷0.2=6÷

X=30

(177) 12x+8x=4.8

20X÷÷20 X=24

(178) 7(x-2)=49

7X-14=49 7X-14+14=49+14

7X=63 7X÷7=63÷7 X=9

(179) 4×8+2x=36 2X+32=36 2X+32-32=36-32 2X=4 2X÷2=4÷2

X=2

(180) (x-2)÷3=7

X-2=3×7 X-2=21 X=23

(181) x÷5+9=21 X÷5=21-9 X÷5=12 X=12×5 X=60

(182) (300-x)÷5=30 300-X=30×5

300-X=150

X=300-150 X=150

(183) 91÷x =1.3 X=91÷ X=70

(184) 41-3x=17 41-3X+3X=17+3X 3X+17-17=41-17 3X=24 3X÷3=24÷3 X=8

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