问题
解答题
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答案
(1)80%x+12=40,
80%x+12-12=40-12,
80%x÷80%=28÷80%,
x=35;
(2)x-20%x=16,
80%x=16,
80%x÷80%x=16÷80%,
x=20;
(3)x+30%x=65,
130%x=65,
130%x÷130%=65÷130%,
x=50;
(4)1-
x=1 3
,5 6
1-
x+1 3
x=1 3
+5 6
x,1 3
1-
=5 6
+5 6
x-1 3
,5 6
÷1 6
=1 3
x÷1 3
,1 3
x=
.1 2
(5)(1-60%)x=0.32,
40%x=0.32,
40%x÷40%=0.32÷40%,
x=0.08;
(6)125%x-x=44,
0.25x=44,
0.25x÷0.25=44÷0.25,
x=176.