问题 解答题

解方程.

6x+1.2×4=9.6

8x-x=12+2.7

5×(x+2.5)=35.

答案

(1)6x+1.2×4=9.6,

6x+4.8=9.6,

6x+4.8-4.8=9.6-4.8,

6x=4.8,

6x÷6=4.6÷6,

x=0.8;

(2)8x-x=12+2.7,

7x=14.7,

7x÷7=14.7÷7,

x=2.1;

(3)5×(x+2.5)=35,

5x+12.5=35,

5x+12.5-12.5=35-12.5,

5x=22.5,

5x÷5=22.5÷5,

x=4.5.

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