题目内容

简便运算.
2
71
+
1
69
)×23+
25
71

5
8
×100+100×
3
8

23
2
3
×3
1
2
+
1
6
+
1
12
+
1
20
+
1
30

200.9×10%+2.009×490+0.2009×5000.
①(
2
71
+
1
69
)×23+
25
71

=
2
71
×23
+
1
69
×23
+
25
71

=(
46
71
+
25
71
)+
23
69

=1+
1
3

=1
1
3


5
8
×100+100×
3
8

=100×(
5
8
+
3
8
),
=100×1,
=100;

③23
2
3
×3
1
2
+
1
6
+
1
12
+
1
20
+
1
30

=
71
3
×
7
2
+
1
2
-
1
3
+…+
1
5
-
1
6

=
497
6
+
1
2
-
1
6

=
497
6
+
2
6

=
499
6

=83
1
6


④200.9×10%+2.009×490+0.2009×5000,
=20.09×1+20.09×49+20.09×50,
=20.09×(1+49+50),
=20.09×100,
=2009.
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