问题 解答题
怎样简便就怎样算.
(5-
5
13
)×26
5
7
×
1
4
+
3
4
×
5
7
2
9
×
5
11
×27×33
1
12
+
5
6
)×24
1
4
+
3
4
×
3
1
19
43
×34+53×
19
43
-
19
43
答案

(1)(5-

5
13
)×26

=5×26-

5
13
×26

=130-10

=120;

(2)

5
7
×
1
4
+
3
4
×
5
7

=

5
7
×(
1
4
+
3
4

=

5
7
×1

=

5
7

(3)

2
9
×
5
11
×27×33

=(

2
9
×27)×(
5
11
×33)

=6×15

=90;

(4)(

1
12
+
5
6
)×24

=

1
12
×24+
5
6
×24

=2+20

=22;

(5)

1
4
+
3
4
×
3
1

=

1
4
+
9
4

=

5
2

(6)

19
43
×34+53×
19
43
-
19
43

=

19
43
×(34+53-1)

=

19
43
×86

=38.

单项选择题
单项选择题