题目内容
求未知数X.
(1)
| (2)25:0.9=X:4.5. |
(1)
X+
X=4.2,
x+
x=4.2,
x=4.2,
x×
=4.2×
,
x=3.6;
(2)25:0.9=X:4.5,
0.9x=25×4.5,
0.9x÷0.9=25×4.5÷0.9,
x=125.
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x=3.6;
(2)25:0.9=X:4.5,
0.9x=25×4.5,
0.9x÷0.9=25×4.5÷0.9,
x=125.
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