问题 解答题
解方程
1.6x+2.4=7.523(x-0.8)=6.328.4-5x=5.8.
答案

(1)1.6x+2.4=7.52,

1.6x+2.4-2.4=7.52-2.4,

1.6x=5.12,

1.6x÷1.6=5.12÷1.6,

x=3.2;

(2)3(x-0.8)=6.3,

3x-2.4=6.3,

3x-2.4+2.4=6.3+2.4,

3x=8.7,

3x÷3=8.7÷3,

x=2.9;

(3)28.4-5x=5.8,

28.4-5x+5x=5.8+5x,

5.8+5x=28.4,

5.8+5x-5.8=28.4-5.8,

5x=22.6,

5x÷5=22.6÷5,

x=4.52.

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