问题 解答题
求未知数x有值.
5x-1.5×2.5=3.25(x-3):2.5=4:5.
答案

(1)5x-1.5×2.5=3.25,

5x-3.75+3.75=3.25+3.75,

5x÷5=7÷5,

x=1.4;

(2)(x-3):2.5=4:5,

5x-15+15=10+15,

5x÷5=25÷5,

x=5.

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