问题
解答题
下面各题,能简算的要简算. (1)30.1-16.8÷3.5×6.2 (2)27×99 (3)
(4)
(5)15×
(6)
|
答案
(1)30.1-16.8÷3.5×6.2,
=30.1-4.8×6.2,
=30.1-29.76,
=0.34;
(2)27×99,
=27×(100-1),
=27×100-27×1,
=2700-27,
=2673;
(3)
5 |
4 |
4 |
5 |
=(
5 |
4 |
4 |
5 |
=1×1,
=1;
(4)
7 |
23 |
7 |
23 |
7 |
8 |
=
7 |
23 |
1 |
8 |
7 |
23 |
7 |
8 |
=
7 |
23 |
1 |
8 |
7 |
8 |
=
7 |
23 |
=
7 |
23 |
(5)15×
1 |
7 |
2 |
3 |
7 |
10 |
=(15×
2 |
3 |
1 |
7 |
7 |
10 |
=10×
1 |
10 |
=1;
(6)
8 |
9 |
4 |
6 |
1 |
3 |
1 |
2 |
=
8 |
9 |
1 |
3 |
1 |
2 |
=
8 |
9 |
2 |
3 |
=
4 |
3 |