问题
解答题
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答案
(1)
x-10%x=1.8,1 5
0.1x=1.8,
0.1x÷0.1=1.8÷0.1,
x=18;
(2)x÷(1-20%)=10.4,
x÷0.8=10.4,
x÷0.8×0.8=10.4×0.8,
x=8.32;
(3)(1+23%)x=18.45,
1.23x=18.45,
1.23x÷1.23=18.45÷1.23,
x=15;
(4)x-45%x=137.5,
55%x=137.5,
55%x÷55%=137.5÷55%,
x=250.