问题
解答题
解方程
(1)40%x-2.8=7.6
(2)x+20%x=3.6
(3)90%x-60%x=48.
答案
(1)40%x-2.8=7.6,
40%x-2.8+2.8=7.6+2.8,
40%x=10.4,
x=10.4÷40%,
x=26,
(2)x+20%x=3.6,
1.2x=3.6,
x=3.6÷1.2,
x=3,
(3)90%x-60%x=48
30%x=48,
x=48÷30%,
x=160.