怎样简便就怎样算:35×1310×31721252528×4157×5.6+45(29+227)×27.-数学

题文

怎样简便就怎样算:
35×1
3
10
×3
17
21

25
25
28
×4
1
5
7
×5.6+
4
5

2
9
+
2
27
)×27.
题型:解答题  难度:中档

答案

35×1
3
10
×3
17
21

=35×
13
10
×
80
21

=173
1
3


25
25
28
×4
=25×4+
25
28
×4,
=100+3
4
7

=103
4
7


1
5
7
×5.6+
4
5

=
12
7
×
28
5
+
4
5

=
48
5
+
4
5

=10
2
5


(
2
9
+
2
27
)×27
=
2
9
×27+
2
27
×27,
=6+2,
=8.