问题 解答题
下面各题怎样算简便就怎样算.
1
5
×
4
9
+
1
5
×
5
9
44×
5
43
5
18
÷
3
4
×
9
10
答案

(1)

1
5
×
4
9
+
1
5
×
5
9

=(

4
9
+
5
9
)×
1
5

=1×

1
5

=

1
5

(2)44×

5
43

=(43+1)×

5
43

=43×

5
43
+1×
5
43

=5+

5
43

=5

5
43

(3)

5
18
÷
3
4
×
9
10

=

5
18
×
4
3
×
9
10

=

1
3

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