题目内容
求未知数x.
8:
=5:x
3x+9.6×0.5=12
2×
x=
.
8:
| 4 |
| 15 |
3x+9.6×0.5=12
2×
| 3 |
| 5 |
| 14 |
| 15 |
(1)8:
=5:x
8x=
×5
8x=
8x÷8=
÷8
x=
(2)3x+9.6×0.5=12
3x+4.8=12
3x+4.8-4.8=12-4.8
3x=7.2
3x÷3=7.2÷3
x=2.4
(3)2×
x=
x=
x×
=
×
x=
| 4 |
| 15 |
8x=
| 4 |
| 15 |
8x=
| 4 |
| 3 |
8x÷8=
| 4 |
| 3 |
x=
| 1 |
| 6 |
(2)3x+9.6×0.5=12
3x+4.8=12
3x+4.8-4.8=12-4.8
3x=7.2
3x÷3=7.2÷3
x=2.4
(3)2×
| 3 |
| 5 |
| 14 |
| 15 |
| 6 |
| 5 |
| 14 |
| 15 |
| 6 |
| 5 |
| 5 |
| 6 |
| 14 |
| 15 |
| 5 |
| 6 |
x=
| 7 |
| 9 |
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