脱式计算,能简算的要简算.80?54×415+40×80% 35×75%+66×34?0.75 45÷[58×(1?20%)] 15×27+35

2025-04-27 04:26:49
推荐回答(1个)
回答1:

(1)80-

5
4
×
4
15
+40×80%,
=80-
1
3
+32,
=111
2
3


(2)35×75%+66×
3
4
?0.75

=35×0.75+66×0.75-0.75,
=(35+66-1)×0.75,
=100×0.75,
=75;

(3)
4
5
÷[
5
8
×(1?20%)]

=
4
5
÷[
5
8
×
4
5
],
=
4
5
÷
1
2

=
8
5


(4)
1
5
×27+
3
5
×41

=
1
5
×27+
1
5
×3×41

=
1
5
×(27+123),
=
1
5
×150

=30.