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(2009•兴国县模拟)脱式计算

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(2009•兴国县模拟)脱式计算
46×8-120÷15                    
(12.5×8-40)÷0.6
7
31
(1)46×8-120÷15,
=368-8,
=360;

(2)(12.5×8-40)÷0.6,
=(100-40)÷0.6,
=60÷0.6,
=100;

(3)
7
31÷
5
2+
3

7
31,
=
7
31×
2
5+
3

7
31,
=(
2
5+
3
5)×
7
31,
=1×
7
31,
=
7
31;

(4)
1
5÷[(
2
3+
1
5)×
1
13],
=
1
5÷[
13
15×
1
13],
=
1

1
15,
=3.