题目内容
求未知数x.
5x+2.5x=30
:x=
:
x-5=25.
5x+2.5x=30
| 1 |
| 10 |
| 1 |
| 6 |
| 1 |
| 4 |
| 1 |
| 5 |
(1)5x+2.5x=30,
7.5x=30,
7.5x÷7.5=30÷7.5,
x=4;
(2)
:x=
:
,
x=
×
,
x=
,
x×6=
×6,
x=
;
(3)
x-5=25,
x-5+5=25+5,
x=30,
x÷
=30÷
,
x=150.
7.5x=30,
7.5x÷7.5=30÷7.5,
x=4;
(2)
| 1 |
| 10 |
| 1 |
| 6 |
| 1 |
| 4 |
| 1 |
| 6 |
| 1 |
| 10 |
| 1 |
| 4 |
| 1 |
| 6 |
| 1 |
| 40 |
| 1 |
| 6 |
| 1 |
| 40 |
x=
| 3 |
| 20 |
(3)
| 1 |
| 5 |
| 1 |
| 5 |
| 1 |
| 5 |
| 1 |
| 5 |
| 1 |
| 5 |
| 1 |
| 5 |
x=150.
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