题目内容

脱式计算.
1
8
+
5
7
+6.875+
2
7
86×
3
85
3
4
+
1
6
-
2
3
)×12.
(1)
1
8
+
5
7
+6.875+
2
7

=(0.125+6.875)+(
5
7
+
2
7
),
=7+1,
=8.

(2)86×
3
85

=(85+1)×
3
85

=85×
3
85
+
3
85

=3
3
85



(3)(
3
4
+
1
6
-
2
3
)×12,
=
3
4
×12+
1
6
×12-
2
3
×12,
=9+2-8,
=3.
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