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用简便方法计算:(512+19+38)×72;817÷13+113×917.

题目详情
用简便方法计算:
(
5
12
+
1
9
+
3
8
)×72;
8
17
÷13+
1
13
×
9
17
▼优质解答
答案和解析
(
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