问题 解答题
脱式计算
①907×99×907
②(
4
5
+
1
4
)÷
7
3
+
7
10

③(0.125×8-0.5)×4
④[1-(
1
2
-
1
4
)]×
2
3
答案

①907×99×907

=89793×907

=81442251;

②(

4
5
+
1
4
)÷
7
3
+
7
10

=

21
20
×
3
7
+
7
10

=

9
20
+
14
20

=1

3
20

③(0.125×8-0.5)×4

=(1-0.5)×4

=0.5×4

=2;

④[1-(

1
2
-
1
4
)]×
2
3

={1-

1
4
2
3

=

3
4
×
2
3

=

1
2

选择题
单项选择题