问题 解答题
解比例.
45:54=60:X
3:2.5=X:40
3
5
6
7
=X:
5
4
40
24
=
5
X
6.5:x=3.25:4
2
3
5
6
=X:9.
答案

(1)45:54=60:x,

45x=54×60,

45x÷45=3240÷45,

x=72;

(2)3:2.5=x:40,

2.5x=3×40,

2.5x÷2.5=120÷2.5,

x=48;

(3)

3
5
6
7
=x:
5
4

6
7
x=
3
5
×
5
4

6
7
x÷
6
7
=
3
4
÷
6
7

x=

7
8

(4)

40
24
=
5
X

40x=24×5,

40x÷40=120÷40,

x=3;

(5)6.5:x=3.25:4,

3.25x=6.5×4,

3.25x÷3.25=26÷3.25,

x=8;

(6)

2
3
5
6
=x:9,

5
6
x=
2
3
×
9,

5
6
x÷
5
6
=6÷
5
6

x=7.2.

选择题
问答题 简答题