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.
(1)7x-0.8×4.2=0.84
(2)3(x-0.4)=12.6.
(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.