脱式计算.(1)100-91÷13 (2)(100-91)÷13 (3)7.73-2.3÷0.5×0.8 (4)(1- 4 5

2024-12-24 22:24:11
推荐回答(1个)
回答1:

(1)100-91÷13,
=100-7,
=93;

(2)(100-91)÷13,
=9÷13,
=
9
13


(3)7.73-2.3÷0.5×0.8,
=7.73-4.6×0.8,
=7.73-3.68,
=4.05;

(4)(1-
4
5
×
3
5
)÷
9
25

=(1-
12
25
÷
9
25

=
13
25
÷
9
25

=
13
9


(5)
3
4
÷[(
2
3
-
1
6
)÷5],
=
3
4
÷[
1
2
÷5],
=
3
4
÷
1
10

=
15
2