问题 解答题
解比例.
7.5:x=2.5:12
4
9
1
6
=x:15
Χ
6.5
=
4
5.2
答案

(1)7.5:x=2.5:12,

2.5x=7.5×12,

x=90÷2.5,

x=36;

(2)

4
9
1
6
=x:15,

1
6
x=15×
4
9

1
6
x×6=
20
3
×
6,

x=40;

(3)

Χ
6.5
=
4
5.2

2x=6.5×4,

x=26÷2,

x=13.

单项选择题
单项选择题