【#文档大全网# 导语】以下是®文档大全网的小编为您整理的《七年级下册数学小练习》,欢迎阅读!
七年级数学计算练习(张)
63y
26y
3y4
(7)1;
(1)7(2x-1)-3(4x-1)=4(3x+2)-1 0.30.40.5 (2)11116
(5y+1)+ 3(1-y)= 8(9y+1)+ 5(1-3y)
(3)23
[3(
12
4
x1)-4
12
]=x+2 (4)
3x122
2x3
x1;
(5)
3y1333y5y41462
;
(6)1.22x1.52.5x
0.2
0.5
3x54
12;
(8)20%+(1-20%)(320-x)=320×40%
(9)2x54x5x3; (10)3y35
2
12
25
y.
(11)1
(x3)122
2(x3)
(12)5(x4)7(7x)9123(9x);
(13)7(2x1)3(4x1)5(3x2)10;
(14)yy1y22
2
5
;
(15)52m67m3
4
m
m2m54
26
(16)0.1x210.3
x0.5
1.2.
(17)111x2
9{7[5(
3
4)6]8}1
(18)5x2y8,3xy7;
(用代入法)
(19)4x7y10,
6x11y280.(用加减法)
(20)x22(y1),2(x2)(y1)5;
x1y2(21),34
x3
4
y33112.
x(22)
12xx
2
32
2x73(x1)(23)
4x312
3
3x
(24)21145x
5
(25)已知3(5x2)54x6(x1), 化简:3x113x
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