直接写得数.①3451÷17×(323-299)=______②22.9×7.34+2.29×26.6=______③16711-(2213-1411)=______④48.48-231120+311325-36.45=______⑤〔1,9-1.9×(1910-1.9)〕÷345=_____-数学

题文

直接写得数.
①3451÷17×(323-299)=______
②22.9×7.34+2.29×26.6=______
③16
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
=______.
题型:解答题  难度:中档

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;

③16
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.

据专家权威分析,试题“直接写得数.①3451÷17×(323-299)=______②22.9×7.34+2.29×26.6..”主要考查你对  整数的四则混合运算及应用题  等考点的理解。关于这些考点的“档案”如下:

整数的四则混合运算及应用题