题目内容
解方程.
x÷
=
15-x=
3x=24×
.
x÷
| 7 |
| 2 |
| 8 |
| 21 |
15-x=
| 5 |
| 6 |
3x=24×
| 1 |
| 8 |
(1)x÷
=
x÷
×
=
×
x=
;
(2)15-x=
15-x+x=
+x
+x=15
+x-
=15-
x=14
;
(3)3x=24×
3x÷3=24×
÷3
x=1.
| 7 |
| 2 |
| 8 |
| 21 |
x÷
| 7 |
| 2 |
| 7 |
| 2 |
| 8 |
| 21 |
| 7 |
| 2 |
x=
| 4 |
| 3 |
(2)15-x=
| 5 |
| 6 |
15-x+x=
| 5 |
| 6 |
| 5 |
| 6 |
| 5 |
| 6 |
| 5 |
| 6 |
| 5 |
| 6 |
x=14
| 1 |
| 6 |
(3)3x=24×
| 1 |
| 8 |
3x÷3=24×
| 1 |
| 8 |
x=1.
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