下面各题,怎样算简便就怎样算. 3.4×1.25+1.25×4.6 1.8÷1.5-0.4×0.7 25×3.2×12.5 (

2024-12-17 07:31:41
推荐回答(1个)
回答1:

(1)3.4×1.25+1.25×4.6
=(3.4+4.6)×1.25,
=8×1.25,
=10;

(2)1.8÷1.5-0.4×0.7
=1.2-0.28,
=0.92;

(3)25×3.2×12.5
=(25×0.4)×(8×12.5),
=10×100,
=1000;

(4)(

9
10
+
3
5
)×(
2
9
-
2
15

=
3
2
×
4
45

=
2
15


(5)35÷[(
5
6
-
2
3
)×3]
=35÷[
1
6
×3),
=35÷
1
2

=70.