题目内容

用简便方法计算
3
8
×
2
7
+
3
8
÷
7
5
7
10
×99+
7
10
67×
5
66
3
8
×13+
13
8
×5.
(1)
3
8
×
2
7
+
3
8
÷
7
5

=
3
8
×
2
7
+
3
8
×
5
7

=
3
8
×(
2
7
+
5
7
),
=
3
8
×1,
=
3
8


(2)
7
10
×99+
7
10

=(99+1)×
7
10

=100×
7
10

=70;

(3)67×
5
66

=(66+1)×
5
66

=66×
5
66
+
5
66

=5+
5
66

=5
5
66


(4)
3
8
×13+
13
8
×5
=
3
8
×13+
5
8
×13,
=(
3
8
+
5
8
)×13,
=1×13,
=13.
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