题目内容
解比例.
:x=
:
=
.
| 9 |
| 5 |
| 3 |
| 10 |
| 19 |
| 4 |
| x |
| 0.6 |
| 2.8 |
| 4.2 |
(1)
:x=
:
,
x=
×
,
x÷
=
×
÷
,
x=28.5;
(2)
=
,
4.2x=0.6×2.8,
4.2x÷4.2=1.68÷4.2,
x=0.4.
| 9 |
| 5 |
| 3 |
| 10 |
| 19 |
| 4 |
| 3 |
| 10 |
| 9 |
| 5 |
| 19 |
| 4 |
| 3 |
| 10 |
| 3 |
| 10 |
| 9 |
| 5 |
| 19 |
| 4 |
| 3 |
| 10 |
x=28.5;
(2)
| x |
| 0.6 |
| 2.8 |
| 4.2 |
4.2x=0.6×2.8,
4.2x÷4.2=1.68÷4.2,
x=0.4.
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