问题
解答题
解方程. (1)
(2)x-0.8x+6=16. |
答案
(1)
=x-3.6 4
,x+4.8 8
8×(x-3.6)=4×(x+4.8),
8x-28.8=4x+19.2,
8x-28.8+28.8=4x+19.2+28.8,
8x=4x+48,
8x-4x=4x-4x+48,
4x=48,
4x÷4=48÷4,
x=12;
(2)x-0.8x+6=16,
0.2x+6=16,
0.2x+6-6=16-6,
0.2x=10,
0.2x÷0.2=10÷0.2,
x=50.