问题
解答题
简便运算
|
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
)×0.5],2 9
=
×[4 9
×2 3
-1 2
×2 9
],1 2
=
×[4 9
-1 3
],1 9
=
×4 9
,2 9
=
.8 81