题目内容
解方程.
| 2X+5=17 | X-
| X×
|
(1)2X+5=17,
2X+5-5=17-5,
2X÷2=12÷2,
X=6;
(2)X-
X=
,
X=
,
X×
=
×
,
X=
;
(3)X×
=18×
,
X×
=
,
X×
×
=
×
,
X=7.5.
2X+5-5=17-5,
2X÷2=12÷2,
X=6;
(2)X-
| 1 |
| 6 |
| 5 |
| 8 |
| 5 |
| 6 |
| 5 |
| 8 |
| 5 |
| 6 |
| 6 |
| 5 |
| 5 |
| 8 |
| 6 |
| 5 |
X=
| 3 |
| 4 |
(3)X×
| 3 |
| 5 |
| 1 |
| 4 |
X×
| 3 |
| 5 |
| 9 |
| 2 |
X×
| 3 |
| 5 |
| 5 |
| 3 |
| 9 |
| 2 |
| 5 |
| 3 |
X=7.5.
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