完整版七年级解方程计算题专项练习
电子印章-民事起诉书
解方程:
(1) x
2
x 1
5
2
(3)
2
x 4 12
3
3
x
(5)
7x 6 22 6x
;
(7)
4x 5 3x
;
(1) 2 (x-1 ) +4=0
(2) 4x -x 3 4
2
5 5
(4) 2 3.5x
4.5x 1
(6) 4x 3 5x 2
;
(8)
3y 7 3y
5
(2) 4- (3-x ) =-2
3)(x+1)-2(x-1)=1-3x
(5)
4(x-1)-10(1-2x)=-3(2x+1) (
(7) 3 (
x+1)-2(x+2)=2x+3
(8) 2(x-1)-(x-3)= 2(1.5x-
(4)2(x-2)-6(x-1)=3 1-x)
6) 2(x+3)-5(1-x
)=3(x-1 )
2.5)
3)(x+1)-2(x-1)=1-3x
(4)2(x-2)-6(x-1)=3 1-x)
10)3x-2[3(x-1)-2(x
+2)]=3(18-x)
(9)3(x-7)-2[9-4(2-x)]=22
3 2 1
(11) - -x 1
2 3 4
2 2-
1
2
2
x
3
3
(12)
4 x -
2
-
3 3
2x
x
⑴
r
3x-1
(町
) -[x
1
2
1
-(x
2
1)]
2
-(x
3
1) (6
(7)
0.2 0.5
4
3 x
(
9
)
3
応
1) 3 2x 3
3x
4x 2
(11)
2
5
1
一架飞机飞行在两个城市之间,顺风需
时,求两个城市之间的距离
2小时,逆风需
(8)
2x — 1 x+2
(io)亍二三 +i
(
12
)
宁
3小时,已知风速为20 千米