问题
解答题
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答案
(1)60%X+4
=8.7,1 2
60%x+4
-41 2
=8.7-41 2
,1 2
60%x÷60%=4.2÷60%,
x=7;
(2)3.4X-120%X=11,
2.2x=11,
2.2x÷2.2=11÷2.2,
x=5;
(3)8.6-2.6X=80%,
8.6-2.6X+2.6x=80%+2.6x,
8.6-80%=80%+2.6x-80%,
7.8÷2.6=2.6x÷2.6,
x=3.