问题 解答题
解比例.
4.8:24=5:x 4:
1
3
=x:
5
2
x:
4
9
=
3
5
8
45
8
15
1
5
=x:
3
8
9:2.5=7.2:x 3
1
2
:x=4:5.6.
答案

(1)4.8:24=5:x

4.8x=24×5

4.8x÷4.8=120÷4.8

x=25

(2)4:

1
3
=x:
5
2

1
3
x=4×
5
2

1
3
x÷
1
3
=10÷
1
3

x=30

(3)x:

4
9
=
3
5
8
45

8
45
x=
4
9
×
3
5

8
45
x÷
8
45
=
4
15
÷
8
45

x=

3
2

(4)

8
15
1
5
=x:
3
8

1
5
x=
8
15
×
3
8

1
5
x÷
1
5
=
1
5
÷
1
5

x=1

(5)9:2.5=7.2:x

9x=2.5×7.2

9x÷9=18÷9

x=2

(6)3

1
2
:x=4:5.6

4x=3

1
2
×5.6

4x÷4=19.6÷4

x=4.9.

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