题目内容
解方程:
X÷
=
7.2-2X=3.8.
| 5 |
| 7 |
| 5 |
| 14 |
| 7 |
| 8 |
7.2-2X=3.8.
(1)
X÷
=
,
X÷
×
=
×
,
X=
,
X×
=
×
,
X=
;
(2)7.2-2X=3.8,
7.2-2X+2X=3.8+2X,
3.8+2X=7.2,
3.8+2X-3.8=7.2-3.8,
2X=3.4,
2X÷2=3.4÷2,
X=1.7.
| 5 |
| 7 |
| 5 |
| 14 |
| 7 |
| 8 |
| 5 |
| 7 |
| 5 |
| 14 |
| 5 |
| 14 |
| 7 |
| 8 |
| 5 |
| 14 |
| 5 |
| 7 |
| 5 |
| 16 |
| 5 |
| 7 |
| 7 |
| 5 |
| 5 |
| 16 |
| 7 |
| 5 |
X=
| 7 |
| 16 |
(2)7.2-2X=3.8,
7.2-2X+2X=3.8+2X,
3.8+2X=7.2,
3.8+2X-3.8=7.2-3.8,
2X=3.4,
2X÷2=3.4÷2,
X=1.7.
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