试题:
简便运算
17×75%-17×25%=25×2.5×32=
4
9
×[(
2
3
-
2
9
)×0.5]
=

答案:

我来补答
(1)17×75%-17×25%,
=17×(75%-25%),
=17×50%,
=8.5;

(2)25×2.5×32,
=25×2.5×4×4×2,
=(25×4)×(2.5×4)×2,
=100×10×2,
=1000×2,
=2000;

(3)
4
9
×[(
2
3
-
2
9
)×0.5]

=
4
9
×[
2
3
×
1
2
-
2
9
×
1
2
],
=
4
9
×[
1
3
-
1
9
],
=
4
9
×
2
9

=
8
81
 
 
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剩余:2000
这些题目你会做吗?