问题 解答题
用简便方法计算.
17×
9
16
(
3
4
+
5
8
)×32
5
9
×
3
4
+
5
9
×
1
4
5
4
×
1
8
×16
答案

(1)17×

9
16

=(16+1)×

9
16

=16×

9
16
+1×
9
16

=9+

9
16

=9

9
16

(2)(

3
4
+
5
8
)×32

=

3
4
×32+
5
8
×32

=24+20

=44;

(3)

5
9
×
3
4
+
5
9
×
1
4

=

5
9
×(
3
4
+
1
4

=

5
9
×1

=

5
9

(4)

5
4
×
1
8
×16

=

5
4
×(
1
8
×16)

=

5
4
×2

=

5
2

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