题目内容
解方程.
Χ+
|
| (2.4+
|
(1)x+
x=20,
(1+
)x=20,
x=20,
x×
=20×
,
x=16;
(2)
x=
+
,
x=
,
x×
=
×
,
x=
;
(3)(2.4+
)x=5,
(2.4+0.6)x=5,
3x=5,
3x÷3=5÷3,
x=
.
| 1 |
| 4 |
(1+
| 1 |
| 4 |
| 5 |
| 4 |
| 5 |
| 4 |
| 4 |
| 5 |
| 4 |
| 5 |
x=16;
(2)
| 10 |
| 21 |
| 3 |
| 8 |
| 1 |
| 3 |
| 10 |
| 21 |
| 17 |
| 24 |
| 10 |
| 21 |
| 21 |
| 10 |
| 17 |
| 24 |
| 21 |
| 10 |
x=
| 119 |
| 80 |
(3)(2.4+
| 3 |
| 5 |
(2.4+0.6)x=5,
3x=5,
3x÷3=5÷3,
x=
| 5 |
| 3 |
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