问题
解答题
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答案
(1)80%X-10=30,
80%X-10+10=30+10,
80%X=40,
80%X÷80%=40÷80%,
X=50;
(2)2.5:
=1 4
,40 χ
2.5X=
×40,1 4
2.5X=10,
2.5X÷2.5=10÷2.5,
X=4;
(3)3X-1.2X=36,
1.8X=36,
1.8X÷1.8=36÷1.8,
X=20;
(4)
X-30%X=2,4 5
0.5X=2,
0.5X÷0.5=2÷0.5,
X=4.