计算下面各题,能用简便方法的就用简便方法99×979824×(78+32-34)16×23÷(45-815)49÷45-(15-13)1-(14+38)÷14358×57+27÷835.-数学
=24×
7 |
8 |
3 |
2 |
3 |
4 |
=21+36-18,
=39;
(3)
1 |
6 |
2 |
3 |
4 |
5 |
8 |
15 |
=
1 |
9 |
4 |
15 |
=
1 |
9 |
15 |
4 |
=
5 |
12 |
(4)
4 |
9 |
4 |
5 |
1 |
5 |
1 |
3 |
=
4 |
9 |
5 |
4 |
1 |
5 |
1 |
3 |
=
5 |
9 |
1 |
3 |
1 |
5 |
=
31 |
45 |
(5)1-(
1 |
4 |
3 |
8 |
1 |
4 |
=1-
5 |
8 |
=1-
5 |
2 |
=-
3 |
2 |
(6)