题目内容

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.

(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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