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．