问题
解答题
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答案
(1)χ-72%χ=56,
0.28χ=56,
0.28χ÷0.28=56÷0.28,
χ=200;
(2)60%χ-35%χ=125,
0.25χ=125,
0.25χ÷0.25=125÷0.25,
χ=500;
(3)Χ-
Χ=3 4
,2 9
X=1 4
,2 9
X÷1 4
=1 4
÷2 9
,1 4
X=
;8 9
(4)25%Χ+
Χ=15,1 2
0.75X=15,
0.75X÷0.75=15÷0.75,
X=20.