脱式计算(能简算就简算)365+289+135 23+79×...

2024-11-23 09:02:26
推荐回答(1个)
回答(1):

(1)365+289+135
=365+135+289
=500+289
=789;

(2)

2
3
+
7
9
×
3
14

=
2
3
+
1
6

=
5
6


(3)
17
8
×
3
5
-
3
5
×12.5%
=(
17
8
-12.5%)×
3
5

=2×
3
5

=
6
5


(4)20-
8
25
-
7
25

=20-(
8
25
+
7
25

=20-
3
5

=19
2
5


(5)3.8×99+3.8
=3.8×(99+1)
=3.8×100
=380;

(6)4×0.27×25
=4×25×0.27
=100×0.27
=27.