问题 解答题
直接写得数.
①3451÷17×(323-299)=______
②22.9×7.34+2.29×26.6=______
16
7
11
-(2
2
13
-1
4
11
)=______
④48.48-23
11
20
+31
13
25
-36.45=______
⑤〔1,9-1.9×(1
9
10
-1.9)〕÷3
4
5
=______.
答案

①3451÷17×(323-299)

=3451÷17×24,

=203×24,

=4872;

②22.9×7.34+2.29×26.6

=2.29×73.4+2.29×26.6,

=(73.4+26.6)×2.29,

=100×2.29,

=229;

16

7
11
-(2
2
13
-1
4
11

=16

7
11
-2
2
13
+1
4
11

=16

7
11
+1
4
11
-2
2
13

=18-2

2
13

=15

1
3

④48.48-23

11
20
+31
13
25
-36.45

=48.48-23.55+31.52-36.45,

=48.48+31.52-(23.55+36.45),

=80-60,

=20.

⑤[1.9-1.9×(1

9
10
-1.9)]÷3
4
5

=[1.9-1.9×(1.9-1.9)]÷

19
5

=[1.9-1.9×0]×

5
19

=1.9×

5
19

=0.5.

单项选择题
单项选择题