题目内容

脱式计算,能简算的就简算.
7
12
÷[
3
4
-(
11
20
-
1
2
)]

38
3
4
-15.38+61.25-4.62

1
8
×5.65+3.35×
1
8
+
1
8

125×83-25×15.
(1)
7
12
÷[
3
4
-(
11
20
-
1
2
)]

=
7
12
÷[
3
4
-
1
20
]

=
7
12
÷
7
10

=
5
6


(2)38
3
4
-15.38+61.25-4.62

=(38
3
4
+61.25)-(15.38+4.62),
=100-20,
=80;

(3)
1
8
×5.65+3.35×
1
8
+
1
8

=
1
8
×(5.65+3.35+1),
=
1
8
×10,
=
5
4


(4)125×83-25×15,
=(25×5)×83-25×15,
=25×415-25×15,
=25×(415-15),
=25×400,
=10000.
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