问题 解答题
怎样简便怎样计算.
2
9
×
5
11
×27×33
2
7
×(1÷
3
4
-
3
4
÷1)
2006×
2004
2005
3
3
4
×2.6+1
2
5
×3.75
19
43
×34+53×
19
43
-
19
43
5
6
×
1
10
+1
1
2
×0.1+2
2
3
÷10.
答案

(1)

2
9
×
5
11
×27×33,

=(

2
9
×27)×(
5
11
×33),

=6×15,

=90;

(2)

2
7
×(1÷
3
4
-
3
4
÷1),

=

2
7
×(
4
3
-
3
4
),

=

2
7
×
7
12

=

1
6

(3)2006×

2004
2005

=(2005+1)×

2004
2005

=2005×

2004
2005
+1×
2004
2005

=2004+

2004
2005

=2004

2004
2005

(4)3

3
4
×2.6+1
2
5
×3.75,

=3.75×2.6+1.4×3.75,

=3.75×(2.6+1.4),

=3.75×4,

=15;

(5)

19
43
×34+53×
19
43
-
19
43

=

19
43
×(34+53-1),

=

19
43
×86,

=38;

(6)

5
6
×
1
10
+1
1
2
×0.1+2
2
3
÷10,

=

5
6
×
1
10
+1
1
2
×
1
10
+2
2
3
×
1
10

=(

5
6
+1
1
2
+2
2
3
)×
1
10

=5×

1
10

=

1
2

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