题目内容
| 解方程: x×(
| x-
|
|
(1)x×(
+
)=27,
x=27,
x×
=27×
,
x=
;
(2)x-
x=
,
(1-
)x=
,
x=
,
x×
=
×
,
x=
;
(3)
=
,
5x=10.5×4,
5x=42,
5x÷5=42÷5,
x=8.4.
| 2 |
| 5 |
| 1 |
| 4 |
| 13 |
| 20 |
| 13 |
| 20 |
| 20 |
| 13 |
| 20 |
| 13 |
x=
| 540 |
| 13 |
(2)x-
| 2 |
| 7 |
| 1 |
| 14 |
(1-
| 2 |
| 7 |
| 1 |
| 14 |
| 5 |
| 7 |
| 1 |
| 14 |
| 5 |
| 7 |
| 7 |
| 5 |
| 1 |
| 14 |
| 7 |
| 5 |
x=
| 1 |
| 10 |
(3)
| 10.5 |
| 5 |
| x |
| 4 |
5x=10.5×4,
5x=42,
5x÷5=42÷5,
x=8.4.
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