题目内容

脱式计算(能简算的要简算).
(1)
5
6
×18+12÷
1
6

(2)
7
5
-
2
5
÷
7
15
-
1
7

(3)99.5×27.5+0.5×27.5
(4)
4
15
×[(
3
4
-
7
12
)÷
4
9
].
(1)
5
6
×18+12÷
1
6

=15+12×6,
=15+72,
=87;

(2)
7
5
-
2
5
÷
7
15
-
1
7

=
7
5
-
2
5
×
15
7
-
1
7

=
7
5
-
6
7
-
1
7

=
7
5
-(
6
7
+
1
7
),
=
7
5
-1,
=
2
5


(3)99.5×27.5+0.5×27.5,
=(99.5+0.5)×27.5,
=100×27.5,
=2750;

(4)
4
15
×[(
3
4
-
7
12
)÷
4
9
],
=
4
15
×[
1
6
×
9
4
],
=
4
15
×
3
8

=
1
10
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