题目内容
解方程
| X+
|
|
(1)
x=
x×
=
×
x=
(2)X+
X=
X=
X×
=
×
X=
(3)
x÷
=18
x÷
×
=18×
x=3
x×
=3×
x=4
| 7 |
| 8 |
| 21 |
| 40 |
| 7 |
| 8 |
| 8 |
| 7 |
| 21 |
| 40 |
| 8 |
| 7 |
x=
| 3 |
| 5 |
(2)X+
| 7 |
| 9 |
| 4 |
| 3 |
| 16 |
| 9 |
| 4 |
| 3 |
| 16 |
| 9 |
| 9 |
| 16 |
| 4 |
| 3 |
| 9 |
| 16 |
X=
| 3 |
| 4 |
(3)
| 3 |
| 4 |
| 1 |
| 6 |
| 3 |
| 4 |
| 1 |
| 6 |
| 1 |
| 6 |
| 1 |
| 6 |
| 3 |
| 4 |
| 3 |
| 4 |
| 4 |
| 3 |
| 4 |
| 3 |
x=4
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