简便运算17×75%-17×25%=25×2.5×32=49×[(23-29)×0.5]=-数学

题目简介

简便运算17×75%-17×25%=25×2.5×32=49×[(23-29)×0.5]=-数学

题目详情

简便运算
17×75%-17×25%=25×2.5×32=
4
9
×[(
2
3
-
2
9
)×0.5]
=
题型:解答题难度:中档来源:不详

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)class="stub"4
9
×[(class="stub"2
3
-class="stub"2
9
)×0.5]

=class="stub"4
9
×[class="stub"2
3
×class="stub"1
2
-class="stub"2
9
×class="stub"1
2
],
=class="stub"4
9
×[class="stub"1
3
-class="stub"1
9
],
=class="stub"4
9
×class="stub"2
9

=class="stub"8
81

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