题目内容
解方程
ⅹ-0.75ⅹ+
=5
5(ⅹ-66)=30-4ⅹ
ⅹ-0.75ⅹ+
| 1 |
| 2 |
5(ⅹ-66)=30-4ⅹ
(1)ⅹ-0.75ⅹ+
=5,
0.25X+
=5,
0.25X+
-
=5-
,
0.25X=4.5,
X=18;
(2)5(ⅹ-66)=30-4ⅹ,
5X-330=30-4X,
5X-330+4X=30-4X+4X,
9ⅹ-330=30,
9X-330+330=30+330,
9X=360,
X=40.
| 1 |
| 2 |
0.25X+
| 1 |
| 2 |
0.25X+
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 2 |
0.25X=4.5,
X=18;
(2)5(ⅹ-66)=30-4ⅹ,
5X-330=30-4X,
5X-330+4X=30-4X+4X,
9ⅹ-330=30,
9X-330+330=30+330,
9X=360,
X=40.
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