问题
解答题
求未知数x. (1)32-40%x=8; (2)0.8:1
(3)5x-2.6x=0.64. |
答案
(1)32-40%x=8,
32-40%x+40%x=8+40%x,
40%x+8-8=32-8,
40%x÷40%=24÷40%,
x=60;
(2)0.8:1
=1 8
,24 x
0.8x=1
×24,1 8
0.8x÷0.8=27÷0.8,
x=33.75;
(3)5x-2.6x=0.64,
2.4x=0.64,
2.4x÷2.4=0.64÷2.4,
x=
.4 15