(完整版)七年级解方程计算题专项练习(可编辑修改word版)
杨柳绿千里-画展前言
解方程:
(1) x
2
x 1
5
(3)
2
x 4 12
3
x
5 5
(5)
7x 6 22 6x
;
(7)
4x 5 3x
;
(2) 4x
1
x 3 4
2
(4) 2
3.5x 4.5x 1
(6)
4x 3 5x 2
;
(8)
3y 7 3y 5
(1)2(x-1)+4=0 (2)4-(3-x)=-2
(3)(x+1)-2(x-1)=1-3x
(4)2(x-2)-6(x-1)=3(1-x)
(5)4(x-1)-10(1-2x)=-3(2x+1)
1)
(7) 3(x+1)-2(x+2)=2x+3
(9)3(x-7)-2[9-4(2-x)]=22
(11)
3 2
1
x
1
2 2
1
2
x
2 4
3
2 3
( 6)
2(x+3)-5(1-x)=3(x-
(8)2(x-1)-(x-3)=
2(1.5x-2.5)
10)3x-2[3(x-1)-2(x+2)]=3(18-x)
(12)
3
4
x
1
2
2x
2
3
3
(
(1)
x
2
=3x-1
x
1 x x 2
3
6
1
(2)
x
x 1
2
5
1
x
1 x x 2
3
6
1
(5)
x
1
x 2
4 x
1
3
[x
1
6
(x 1)]
2
2
(x 1)
2 2 3
(7)
x 2
0.2
x 1
0.5
3
(9)
4
3
(
x
1) 3
2x
3
3
2 2
(6)
8)
x 8
3
x
2x-1 x + 2
(10)
3
=
2
+1
(
<
br>
<
br>
3x 1 4x 2
(11)
1
2 5
(12)
3
y 12
2
5 y 7
4 3
一架飞机飞行在两个城市之间,顺风需 2 小时,逆风需 3 小时,已知风速为 20
千米时,求两个城市之间的距离