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解方程,或解比例:(1)-3x+6=8;(2)2(x-3)+9(x-3)-4(x-3)=0;(3)x:35=2:13;(4)x-0.8x-60=16;(5)-0.4x+0.1=-0.5x+0.2;(6)x+13-x-26=4-x2-1.
题目详情
解方程,或解比例:
(1)-3x+6=8;
(2)2(x-3)+9(x-3)-4(x-3)=0;
(3)x:
=2:
;
(4)x-0.8x-60=16;
(5)-0.4x+0.1=-0.5x+0.2;
(6)
-
=
-1.
(1)-3x+6=8;
(2)2(x-3)+9(x-3)-4(x-3)=0;
(3)x:
3 |
5 |
1 |
3 |
(4)x-0.8x-60=16;
(5)-0.4x+0.1=-0.5x+0.2;
(6)
x+1 |
3 |
x-2 |
6 |
4-x |
2 |
▼优质解答
答案和解析
(1)移项、合并同类项,得:-3x=2
解得:x=-
;
(2)去括号,得2x-6+9x-27-4x+12=0
移项,得2x+9x-4x=6+27-12
合并同类项,得:7x=21
解得x=3;
(3)变形,得
x=
两边都乘3,得x=
;
(4)移项,得x-0.8x=60+16
合并同类项,得,0.2x=76
解得x=380;
(5)移项,得0.5x-0.4x=0.2-0.1
合并同类项,得0.1x=0.1
解得x=1;
(6)方程两边都乘6,得2(x+1)-(x-2)=3(4-x)-6
去括号,得2x+2-x+2=12-3x-6
移项、合并同类项,得4x=2
解得x=
.
解得:x=-
2 |
3 |
(2)去括号,得2x-6+9x-27-4x+12=0
移项,得2x+9x-4x=6+27-12
合并同类项,得:7x=21
解得x=3;
(3)变形,得
1 |
3 |
6 |
5 |
两边都乘3,得x=
18 |
5 |
(4)移项,得x-0.8x=60+16
合并同类项,得,0.2x=76
解得x=380;
(5)移项,得0.5x-0.4x=0.2-0.1
合并同类项,得0.1x=0.1
解得x=1;
(6)方程两边都乘6,得2(x+1)-(x-2)=3(4-x)-6
去括号,得2x+2-x+2=12-3x-6
移项、合并同类项,得4x=2
解得x=
1 |
2 |
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