问题 解答题
求未知数X:
0.75X-25%X=50.4×0.25+0.5X=12.2
8
X
=1.2:6.
答案

(1)0.75X-25%X=5,

0.5X=5,

0.5X÷0.5=5÷0.5,

X=10;

(2)0.4×0.25+0.5X=12.2,

0.1+0.5X=12.2,

0.1+0.5X-0.1=12.2-0.1,

0.5X=12.1,

0.5X÷0.5=12.1÷0.5,

X=24.2;

(3)

8
X
=1.2:6,

1.2X=8×6,

1.2X=48,

1.2X÷1.2=48÷1.2,

X=40.

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