题目内容
解方程.
x+
=12
2x-
x=
42%x=1050.
x+
| 9 |
| 4 |
2x-
| 4 |
| 3 |
| 1 |
| 2 |
42%x=1050.
(1)x+
=12,
x+
-
=12-
,
x=9
;
(2)2x-
x=
,
x=
,
x×
=
×
,
x=
;
(3)42%x=1050,
0.42x=1050,
0.42x÷0.42=1050÷0.42,
x=2500.
| 9 |
| 4 |
x+
| 9 |
| 4 |
| 9 |
| 4 |
| 9 |
| 4 |
x=9
| 3 |
| 4 |
(2)2x-
| 4 |
| 3 |
| 1 |
| 2 |
| 2 |
| 3 |
| 1 |
| 2 |
| 2 |
| 3 |
| 3 |
| 2 |
| 1 |
| 2 |
| 3 |
| 2 |
x=
| 3 |
| 4 |
(3)42%x=1050,
0.42x=1050,
0.42x÷0.42=1050÷0.42,
x=2500.
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