问题 解答题
怎样简便就怎么算
4
5
÷
2
3
3
4
×
2
9
5
7
×1
4
5
48×(
1
8
+
1
6
)
4÷
5
3
÷
9
20
3
10
×(
5
7
-
10
21
)
答案

(1)

4
5
÷
2
3

=

4
5
×
3
2

=1

1
5

(2)

3
4
×
2
9
=
1
6

(3)

5
7
×1
4
5

=

5
7
×
9
5

=1

2
7

(4)48×(

1
8
+
1
6
),

=48×

1
8
+48×
1
6

=6+8,

=14;

(5)4÷

5
3
÷
9
20

=4×

3
5
×
20
9

=

12
5
×
20
9

=5

1
3

(6)

3
10
×(
5
7
-
10
21
),

=

3
10
×
5
21

=

1
14

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