问题 解答题

解方程.

x-8.5=8.5

4.3x+1.8x=27.45

2x+28=56.

答案

(1)x-8.5=8.5,

x-8.5+8.5=8.5+8.5,

x=17;

(2)4.3x+1.8x=27.45,

6.1x=27.45,

6.1x÷6.1=27.45÷6.1,

x=4.5;

(3)2x+28=56,

2x+28-28=56-28,

2x÷2=28÷2,

x=14.

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