题目内容
求未知数x的值.
| (1)5x+0.75×4=6.5 | (2)x:
|
(1)5x+0.75×4=6.5,
5x+3=6.5,
5x+3-3=6.5-3,
5x=3.5,
5x÷5=3.5÷5,
x=0.7;
(2)x:
=21:
,
x=
×21
x=
,
x×8=
×8,
5x=60,
5x÷5=60÷5,
x=12.
5x+3=6.5,
5x+3-3=6.5-3,
5x=3.5,
5x÷5=3.5÷5,
x=0.7;
(2)x:
| 5 |
| 14 |
| 5 |
| 8 |
| 5 |
| 8 |
| 5 |
| 14 |
| 5 |
| 8 |
| 15 |
| 2 |
| 5 |
| 8 |
| 15 |
| 2 |
5x=60,
5x÷5=60÷5,
x=12.
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