用你喜欢的方法脱式计算.203×45-3780÷35; 0.6251×1.8÷4.5+7.5;0.25×0.24×4; 9/10×[7/8÷﹙4/5+1/4﹚].

问题描述:

用你喜欢的方法脱式计算.
203×45-3780÷35;               
0.6251×1.8÷4.5+7.5;
0.25×0.24×4;               

9
10
×[
7
8
÷﹙
4
5
+
1
4
﹚].

(1)203×45-3780÷35
=9135-108
=9027;
(2)0.6251×1.8÷4.5+7.5
=0.25004+7.5
=7.75004;
(3)0.25×0.24×4
=0.25×4×0.24
=0.24;
(4)

9
10
×[
7
8
÷﹙
4
5
+
1
4
﹚]
=
9
10
×[
7
8
÷
21
20
]
=
9
10
×
5
6

=
3
4