题目内容
解比例:
:X=40
0.2:4=X:
.
| 20 |
| 3 |
0.2:4=X:
| 1 |
| 2 |
(1)
:x=40
40x=
40x÷40=
÷40
x=
;
(2)0.2:4=x:
4x=0.2×
4x÷4=0.1÷4
x=0.025.
| 20 |
| 3 |
40x=
| 20 |
| 3 |
40x÷40=
| 20 |
| 3 |
x=
| 1 |
| 6 |
(2)0.2:4=x:
| 1 |
| 2 |
4x=0.2×
| 1 |
| 2 |
4x÷4=0.1÷4
x=0.025.
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