问题
解答题
解方程.
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答案
(1)0.3x+90%=54,
0.3x+90%-90%=54-90%,
0.3x=53.1,
0.3x÷0.3=53.1÷0.3,
x=177;
(2)12-5x=6.5,
12-5x+5x=6.5+5x,
5x+6.5=12,
5x+6.5-6.5=12-6.5,
5x=5.5,
5x÷5=5.5÷5,
x=1.1;
(3)
x-2 3
x=42,1 2
x=42,1 6
x÷1 6
=42÷1 6
,1 6
x=252.