问题 解答题
简便运算
17×75%-17×25%=25×2.5×32=
4
9
×[(
2
3
-
2
9
)×0.5]
=
答案

(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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