题目内容
如果X和Y成正比例,那么“?”填______,如果X和Y成反比例,那么“?”填______.
| X | 4 | ? |
| Y | 80 | 100 |
(1)
=
,
80X=4×100,
80X÷80=400÷80,
X=5;
(2)100X=80×4,
100X=320,
100X÷100=320÷100,
X=3.2;
故答案为:5,3.2.
| X |
| 100 |
| 4 |
| 80 |
80X=4×100,
80X÷80=400÷80,
X=5;
(2)100X=80×4,
100X=320,
100X÷100=320÷100,
X=3.2;
故答案为:5,3.2.
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