题目内容
解比例.
(1)
=
(2)2.7:x=54:18
(3)
:
=x:
(4)
=
.
(1)
| x |
| 8 |
| 4.5 |
| 0.9 |
(2)2.7:x=54:18
(3)
| 1 |
| 20 |
| 1 |
| 3 |
| 5 |
| 9 |
(4)
| 1.25 |
| 2.25 |
| x |
| 1.6 |
(1)
=
,
0.9x=4.5×0.8,
x=
,
x=4;
(2)2.7:x=54:18,
54x=2.7×18,
x=
,
x=0.9;
(3)
:
=x:
,
x=
×
,
x=
,
x=
÷
,
x=
;
(4)
=
,
2.25x=1.25×1.6,
x=
,
x=
.
| x |
| 8 |
| 4.5 |
| 0.9 |
0.9x=4.5×0.8,
x=
| 4.5×0.8 |
| 0.9 |
x=4;
(2)2.7:x=54:18,
54x=2.7×18,
x=
| 2.7×18 |
| 54 |
x=0.9;
(3)
| 1 |
| 20 |
| 1 |
| 3 |
| 5 |
| 9 |
| 1 |
| 3 |
| 1 |
| 20 |
| 5 |
| 9 |
| 1 |
| 3 |
| 1 |
| 36 |
x=
| 1 |
| 36 |
| 1 |
| 3 |
x=
| 1 |
| 12 |
(4)
| 1.25 |
| 2.25 |
| x |
| 1.6 |
2.25x=1.25×1.6,
x=
| 1.25×1.6 |
| 2.25 |
x=
| 8 |
| 9 |
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