问题
解答题
解方程.
x+3.8=10
x-18.6=21.8
x÷6=0.7
5.4x=2.7.
答案
(1)x+3.8=10,
x+3.8-3.8=10-3.8,
x=6.2;
(2)x-18.6=21.8,
x-18.6+18.6=21.8+18.6,
x=40.4;
(3)x÷6=0.7,
x÷6×6=0.7×6,
x=4.2;
(4)5.4x=2.7,
5.4x÷5.4=2.7÷5.4,
x=0.5.