问题
解答题
求未知数X:
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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)
=1.2:6,8 X
1.2X=8×6,
1.2X=48,
1.2X÷1.2=48÷1.2,
X=40.