问题 解答题
用简便方法计算:
(
5
12
+
1
9
+
3
8
)×72

8
17
÷13+
1
13
×
9
17
答案

(

5
12
+
1
9
+
3
8
)×72,

=

5
12
×72+
1
9
×
72+
3
8
×72;

=30+8+27,

=65;

8
17
÷13+
1
13
×
9
17

=

8
17
×
1
13
+
1
13
×
9
17

=(

8
17
+
9
17
)×
1
13

=1×

1
13

=

1
13

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