题目内容

脱式计算(能简算的要简算)
(1)
1
6
÷[1÷(
3
5
-
3
10
)]

(2)3.6-2.8+7.4-7.2
(3)87×
3
86
+
83
86
(1)
1
6
÷[1÷(
3
5
-
3
10
)],
=
1
6
÷[1÷
3
10
],
=
1
6
÷
10
3

=
1
20


(2)3.6-2.8+7.4-7.2,
=(3.6+7.4)-(2.8+7.2),
=11-10,
=1;

(3)87×
3
86
+
83
86

=(86+1)×
3
86
+
83
86

=86×
3
86
+1×
3
86
+
83
86

=3+
3
86
+
83
86

=3+(
3
86
+
83
86
),
=3+1,
=4.
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