问题 解答题
递等式计算.(能简算的要简算)
19.67-(1.67+2
2
9
)-1
7
9

(4-3.6×
2
3
)÷
4
5

11
18
×
2
7
+
11
7
×
5
18

3.5×
4
5
+5.5×80%+0.8
6.4×1.25×2.5
2008÷2009×2010.
答案

(1)19.67-(1.67+2

2
9
)-1
7
9

=19.67-1.67-2

2
9
-1
7
9

=(19.67-1.67)-(2

2
9
+1
7
9
),

=18-4,

=14;

(2)(4-3.6×

2
3
)÷
4
5

=(4-2.4)÷

4
5

=1.6÷

4
5

=2;

(3)

11
18
×
2
7
+
11
7
×
5
18

=

11
18
×
2
7
+
11
18
×
5
7

=

11
18
×(
2
7
+
5
7
),

=

11
18

(4)3.5×

4
5
+5.5×80%+0.8,

=3.5×0.8+5.5×0.8+0.8,

=(3.5+5.5+1)×0.8,

=10×0.8,

=8;

(5)6.4×1.25×2.5,

=(8×0.8)×1.25×2.5,

=(8×1.25)×(8×2.5),

=10×20,

=200;

(6)2008÷2009×2010,

=

2008
2009
×2010,

=

2008
2009
×(2009+1),

=

2008
2009
×2009+
2008
2009
×1,

=2008+

2008
2009

=2008

2008
2009

单项选择题
单项选择题