脱式计算46×8-120÷15(12.5×8-40)÷0.6 7 31 ÷ 5 2 + 3 5 ×

2024-11-19 09:30:56
推荐回答(1个)
回答1:

(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
5
×
7
31

=
7
31
×
2
5
+
3
5
×
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
5
÷
1
15

=3.