题目内容
解方程.
| x-15%x=1.7+6.8 |
| 3×(x-3)=x-5 |
|
(1)x-15%x=1.7+6.8,
0.85x=8.5,
0.85x÷0.85=8.5÷0.85,
x=10;
(2)
-8x=
,
-8x+8x-
=
+8x-
,
=8x,
8x=
,
8x÷8=
÷8,
x=
;
(3)3×(x-3)=x-5,
3x-9=x-5,
3x-9-x+9=x-5-x+9,
2x=4,
2x÷2=4÷2,
x=2;
(4)
÷x=
,
÷x×x×
=
×x×
,
=x,
x=
.
0.85x=8.5,
0.85x÷0.85=8.5÷0.85,
x=10;
(2)
| 3 |
| 4 |
| 1 |
| 6 |
| 3 |
| 4 |
| 1 |
| 6 |
| 1 |
| 6 |
| 1 |
| 6 |
| 7 |
| 12 |
8x=
| 7 |
| 12 |
8x÷8=
| 7 |
| 12 |
x=
| 7 |
| 96 |
(3)3×(x-3)=x-5,
3x-9=x-5,
3x-9-x+9=x-5-x+9,
2x=4,
2x÷2=4÷2,
x=2;
(4)
| 7 |
| 2 |
| 18 |
| 5 |
| 7 |
| 2 |
| 5 |
| 18 |
| 18 |
| 5 |
| 5 |
| 18 |
| 35 |
| 36 |
x=
| 35 |
| 36 |
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