问题 解答题
解比例.
0.4:X=
2
5
3
8
X:
2
3
=
3
4
1
3
X:
1
2
=
3
5
1
6
答案

(1)0.4:X=

2
5
3
8

2
5
X=0.4×
3
8

2
5
X=0.15,

2
5
x÷
2
5
=0.15÷
2
5

X=0.375;

(2)X:

2
3
=
3
4
1
3

1
3
x=
2
3
×
3
4

1
3
x=
1
2

1
3
x÷
1
3
=
1
2
÷
1
3

x=1.5;

(3)X:

1
2
=
3
5
1
6

1
6
x=
1
2
×
3
5

1
6
x=
3
10

1
6
x÷
1
6
=
3
10
÷
1
6

x=1.8.

单项选择题
填空题