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.

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