第五单元《解方程》计算练习(专项训练)人教版数学五年级上册
1.a ÷1.5=13.5
2.x÷3=78
3.x-23=38
4.7y=4.9
5.y÷0.3=6.6
6.解下列一元一次方程:
(1)
(2)
7.解下列方程
(1)2.5(x-1.9)=5.5
(2)4×2.3+2x=9.8
(3)6.7x+2.2x=93.45
(4)67.8-1.5x=34.2
8.解下列方程:
(1)60﹣4x=36
(2)3.4x﹣1.2x=46
9.0.8x-4=1.6
10.解下列方程
(1)42x+25x=536
(2)13(x+5)=169
11.解下列一元一次方程:
(1)x+3=8
(2)8-x=3
(3)x÷3=9
(4)3x=9
12.方程。
(1) x =
(2)x + x =7
(3)x÷ =
13.解下列方程,要求检验的要检验
(1)8x-37=283
(2)4×(12+x)=80
(3)8x+9=17(检验)
(4)(50-14x)÷2=11(检验)
答案解析部分
1.【答案】解:a÷1.5=13.5
a=13.5×1.5
a=20.25
2.【答案】解:x÷3=78
x=78×3
x=234
3.【答案】解:x-23=38
x=38+23
x=61
4.【答案】解:7y=4.9
y=4.9÷7
y=0.7
5.【答案】解:y÷0.3=6.6
y=6.6×0.3
y=1.98
6.【答案】(1)解:20+4x=32-2x
4x+2x=32-20
6x=12
x=12÷6
x=2
(2)解: 15-3x=19-4x
4x-3x=19-15
x=4
7.【答案】(1)2.5(x-1.9)=5.5
x-1.9=5.5÷2.5
x-1.9=2.2
x=2.2+1.9
x=4.1
(2)4×2.3+2x=9.8
9.2+2x=9.8
2x=9.8-9.2
2x=0.6
x=0.3
(3)6.7x+2.2x=93.45
8.9x=93.45
x=93.45÷8.9
x=10.5
(4)67.8-1.5x=34.2
1.5x=67.8-34.2
1.5x=33.6
x=33.6÷1.5
x=22.4
8.【答案】(1) 60﹣4x=36
解:60﹣4x+4x=36+4x
36+4x=60
36+4x﹣36=60﹣36
4x=24
4x÷4=24÷4
x=6
(2)3.4x﹣1.2x=46
解:2.2x=46
2.2x÷2.2=46÷2.2
x=20
9.【答案】解:0.8x-4=1.6 0.8x-4+4=1.6+4 0.8x=5.6 x=7
10.【答案】(1)42x+25x=536
解:67x=536
x=536÷67
x=8
(2)13(x+5)=169
解:x+5=169÷13
x+5=13
x=13-5
x=8
11.【答案】(1)解:x+3=8
x=8-3
x=5
(2)解:8-x=3
8-3=x
x=8-3
x=5
(3)解:x÷3=9
x=3×9
x=27
(4)解:3x=9
x=9÷3
x=3
12.【答案】(1) x =
解: ÷
(2)x+ x =7
解: x= 7
x= 4
(3) x÷ =
解: = ×
=
13.【答案】(1)8x-37=283
8x=37+283
8x=320
x=320÷8
x=40
(2)4×(12+x)=80
12+x=80÷4
12+x=20
x=20-12
x=8
(3)8x+9=17
8x=17-9
8x=8
x=8÷8
x=1
检验:左边=8×1+9=17,右边=17,
左边=右边
所以x=1是方程的解
(4)(50-14x)÷2=11
50-14x=11×2
50-14x=22
50-22=14x
14x=50-22
14x=28
x=28÷14
x=2
检验:左边=(50-14x2)÷2=(50-28)÷2=22÷2=11,右边=11,
左边=右边
所以x=2是方程的解