问题 解答题

解方程:

6x+x=421.2x-x=0.965y-3.7=8.57a+3×4=40.

答案

6x+x=42,

7x=42,

7x÷7=42÷7,

x=6;

1.2x-x=0.96,

0.2 x=4.8,

0.2x×5=4.8×5,

x=24;

5y-3.7=8.5,

5y-3.7+3.7=8.5+3.7,

5y=12.2,

5y÷5=12.2÷5,

y=2.44;

7a+3×4=40,

7a+12=40,

7a+12-12=40-12,

7a=28,

7a÷7=28÷7,

a=4.

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