题目内容
解比解例.
(1)
=
(2)X:18.5=5:4
(3)8:X=
:
(4)0.5:0.25=0.2:X.
(1)
| 3 |
| 8 |
| 2 |
| x |
(2)X:18.5=5:4
(3)8:X=
| 1 |
| 3 |
| 1 |
| 4 |
(4)0.5:0.25=0.2:X.
(1)
=
,
3x=8×2,
3x÷3=16÷3,
x=5
;
(2)X:18.5=5:4,
4x=18.5×5,
4x÷4=92.5÷4,
x=23.125;
(3)8:X=
:
,
x=8×
,
x÷
=2÷
,
x=6;
(4)0.5:0.25=0.2:X,
0.5x=0.25×0.2,
0.5x÷0.5=0.05÷0.5,
x=0.1.
| 3 |
| 8 |
| 2 |
| x |
3x=8×2,
3x÷3=16÷3,
x=5
| 1 |
| 3 |
(2)X:18.5=5:4,
4x=18.5×5,
4x÷4=92.5÷4,
x=23.125;
(3)8:X=
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 3 |
| 1 |
| 3 |
| 1 |
| 3 |
x=6;
(4)0.5:0.25=0.2:X,
0.5x=0.25×0.2,
0.5x÷0.5=0.05÷0.5,
x=0.1.
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