问题
解答题
你认为怎样简便就怎样算: (1)12×
(2)(25+
(3)12×
(4)(
(5)[1-(
|
答案
①12×
6 |
5 |
3 |
10 |
=12×
6 |
5 |
10 |
3 |
=48;
②(25+
3 |
4 |
1 |
4 |
=(25+
3 |
4 |
=25×4+
3 |
4 |
=100+3
=103;
③12×
5 |
6 |
2 |
5 |
=12×
5 |
6 |
2 |
5 |
1 |
4 |
=10-
1 |
10 |
=9
9 |
10 |
④(
1 |
3 |
1 |
4 |
1 |
2 |
2 |
3 |
=(
1 |
3 |
1 |
4 |
2 |
3 |
=
1 |
3 |
1 |
4 |
2 |
3 |
=
2 |
3 |
1 |
2 |
2 |
3 |
=(
2 |
3 |
2 |
3 |
1 |
2 |
=
4 |
3 |
1 |
2 |
=
5 |
6 |
⑤[1-(
1 |
4 |
1 |
4 |
1 |
4 |
=[1-(
1 |
4 |
1 |
4 |
=1×4-(
1 |
4 |
1 |
4 |
=4-(
1 |
4 |
1 |
4 |
=4-(1+1)
=4-2
=2.