题目内容
求未知数x.
2.4×1.5+1.2x=7.2
:
=x:9
=30%
2.4×1.5+1.2x=7.2
| 2 |
| 3 |
| 5 |
| 6 |
| 0.75 |
| x |
(1)2.4×1.5+1.2x=7.2,
3.6+1.2x=7.2,
3.6+1.2x-3.6=7.2-3.6,
1.2x=3.6,
1.2x÷1.2=3.6÷1.2,
x=3,
(2)
:
=x:9,
x=9×
,
x×
=6×
,
x=
,
(3)
=30%,
30%x=0.75,
30%x÷30%=0.75÷30%,
x=2.5.
3.6+1.2x=7.2,
3.6+1.2x-3.6=7.2-3.6,
1.2x=3.6,
1.2x÷1.2=3.6÷1.2,
x=3,
(2)
| 2 |
| 3 |
| 5 |
| 6 |
| 5 |
| 6 |
| 2 |
| 3 |
| 5 |
| 6 |
| 6 |
| 5 |
| 6 |
| 5 |
x=
| 36 |
| 5 |
(3)
| 0.75 |
| x |
30%x=0.75,
30%x÷30%=0.75÷30%,
x=2.5.
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