题目内容
解方程.
80%X+12=40X-20%X=16X+30%X=65.
80%X+12=40X-20%X=16X+30%X=65.
(1)80%X+12=40,
80%X+12-12=40-12,
80%X=28,
80%X÷80%=28÷80%,
X=35;
(2)X-20%X=16,
80%X=16,
80%X÷80%=16÷80%,
X=12.8;
(3)X+30%X=65,
130%X=65,
130%X÷130%=65÷130%,
X=50.
80%X+12-12=40-12,
80%X=28,
80%X÷80%=28÷80%,
X=35;
(2)X-20%X=16,
80%X=16,
80%X÷80%=16÷80%,
X=12.8;
(3)X+30%X=65,
130%X=65,
130%X÷130%=65÷130%,
X=50.
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