问题
解答题
解方程.
X-40%X=42
20%X+1.2=4
75%X+X=35.
答案
(1)x-40%x=42,
0.6x=42,
0.6x÷0.6=42÷0.6,
x=70;
(2)20%X+1.2=4,
20%x+1.2-1.2=4-1.2,
20%x=2.8,
20%x÷20%=2.8÷20%,
x=14;
(3)75%X+X=35.
1.75x=35,
1.75x÷1.75=35÷1.75,
x=20.