问题 解答题

(1)7x-0.8×4.2=0.84

(2)3(x-0.4)=12.6.

答案

(1)7x-0.8×4.2=0.84,

7x-3.36+3.36=0.84+3.36,

7x÷7=4.2÷7,

x=0.6;

(2)3(x-0.4)=12.6,

3(x-0.4)÷3=12.6÷3,

x-0.4+0.4=4.2+0.4,

x=4.6.

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