问题
解答题
解方程:
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答案
(1)7x-25=13.5,
7x-25+25=13.5+25,
7x=38.5,
7x÷7=38.5÷7,
x=5.5;
(2)
=0.1 x
,0.25 0.125
0.25x=0.1×0.125,
0.25x=0.0125,
0.25x÷0.25=0.0125÷0.25,
x=0.05;
(3)12(2+x)=42,
12(2+x)÷12=42÷12,
2+x=3.5,
2+x-2=3.5-2,
x=1.5.