问题
解答题
解方程.
(1)10-8x=6
(2)5×2.6-5x=9.6
(3)3(3+2x)=15
(4)5x+0.5x=16.5.
答案
(1)10-8x=6,
10-8x+8x=6+8x,
10-6=6+8x-6,
4÷8=8x÷8,
x=0.5;
(2)5×2.6-5x=9.6,
13-5x+5x=9.6+5x,
13-9.6=9.6+5x-9.6,
3.4÷5=5x÷5,
x=0.68;
(3)3(3+2x)=15,
3(3+2x)÷3=15÷3,
3+2x-3=5-3,
2x÷2=2÷2,
x=1;
(4)5x+0.5x=16.5,
5.5x=16.5,
5.5x÷5.5=16.5÷5.5,
x=3.