题目内容
解方程.
(1-
)x=
x+
x=34
x÷
=
÷
.
(1-
| 7 |
| 8 |
| 21 |
| 40 |
x+
| 7 |
| 10 |
x÷
| 7 |
| 15 |
| 15 |
| 36 |
| 5 |
| 24 |
(1)(1-
)x=
,
x=
,
x÷
=
÷
,
x=4.2;
(2)x+
x=34,
1.7x=34,
1.7x÷1.7=34÷1.7,
x=20;
(3)x÷
=
÷
,
x÷
=2,
x÷
=2÷
,
x=4
.
| 7 |
| 8 |
| 21 |
| 40 |
| 1 |
| 8 |
| 21 |
| 40 |
| 1 |
| 8 |
| 1 |
| 8 |
| 21 |
| 40 |
| 1 |
| 8 |
x=4.2;
(2)x+
| 7 |
| 10 |
1.7x=34,
1.7x÷1.7=34÷1.7,
x=20;
(3)x÷
| 7 |
| 15 |
| 15 |
| 36 |
| 5 |
| 24 |
x÷
| 7 |
| 15 |
x÷
| 7 |
| 15 |
| 7 |
| 15 |
x=4
| 2 |
| 7 |
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