问题
解答题
直接写得数. ①3451÷17×(323-299)=______ ②22.9×7.34+2.29×26.6=______ ③16
④48.48-23
⑤〔1,9-1.9×(1
|
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 |
13 |
4 |
11 |
=16
7 |
11 |
2 |
13 |
4 |
11 |
=16
7 |
11 |
4 |
11 |
2 |
13 |
=18-2
2 |
13 |
=15
1 |
3 |
④48.48-23
11 |
20 |
13 |
25 |
=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 |
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.