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(2012•四川)脱式计算.546+785-146=2.7×4.8+2.7×5.2=45×94÷75=0.4×(2.5×73)89÷(56−34)512×113−14÷13.

题目详情
(2012•四川)
脱式计算.
546+785-146=
2.7×4.8+2.7×5.2=
4
5
×
9
4
÷
7
5
=
0.4×(2.5×73)
8
9
÷(
5
6
3
4
)
5
12
×
1
13
1
4
÷13.
▼优质解答
答案和解析

(1)546+785-146,
=546-146+785,
=400+785,
=1185;

(2)2.7×4.8+2.7×5.2,
=2.7×(4.8+5.2),
=2.7×10,
=27;

(3)
4
5
×
9
4
÷
7
5

=
9
5
÷
7
5

=
9
7


(4)0.4×(2.5×73),
=(0.4×2.5)×73,
=1×73,
=73;

(5)
8
9
÷(
5
6
3
4
),
=
8
9
÷
1
12

=
32
3


(6)
5
12
×
1
13
1
4
÷13,
=
5
12
×
1
13
1
4
×
1
13

=(
5
12
1
4
1
13

=
1
6
×
1
13

=
1
78