问题 解答题
脱式计算
[11.4-(9.1×
6
7
+1.2)]÷1
3
5
+1÷0.25
4
1
2
÷[2
2
5
-(
3
4
×1
1
3
+0.4)]-1.75.
答案

(1)[11.4-(9.1×

6
7
+1.2)]÷1
3
5
+1÷0.25,

=[11.4-(7.8+1.2)]÷1

3
5
+1÷0.25,

=[11.4-9]÷1

3
5
+1÷0.25

=2.4÷1

3
5
+1÷0.25,

=1.5+4,

=5.5;

(2)4

1
2
÷[2
2
5
-(
3
4
×1
1
3
+0.4)]-1.75,

=4

1
2
÷[2
2
5
-(1+0.4)]-1.75,

=4

1
2
÷[2
2
5
-1.4]-1.75,

=4

1
2
÷1-1.75,

=4.5-1.75,

=2.75.

单项选择题
单项选择题