题目内容
求未知数x的值
(1)
=
(2)
-5x=
.
(1)
| 10 |
| x |
| 2.5 |
| 8 |
(2)
| 3 |
| 4 |
| 5 |
| 8 |
(1)
=
,
2.5x=10×8,
2.5x÷2.5=80÷2.5,
x=32;
(2)
-5x=
,
-5x+5x=
+5x,
+5x=
,
+5x-
=
-
,
5x=
,
x=
.
| 10 |
| x |
| 2.5 |
| 8 |
2.5x=10×8,
2.5x÷2.5=80÷2.5,
x=32;
(2)
| 3 |
| 4 |
| 5 |
| 8 |
| 3 |
| 4 |
| 5 |
| 8 |
| 5 |
| 8 |
| 3 |
| 4 |
| 5 |
| 8 |
| 5 |
| 8 |
| 3 |
| 4 |
| 5 |
| 8 |
5x=
| 1 |
| 8 |
x=
| 1 |
| 40 |
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