问题 解答题
求未知数x.
(1)32-40%x=8;
(2)0.8:1
1
8
=
24
x

(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

1
8
×24,

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

单项选择题
单项选择题