问题
解答题
简便运算.
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答案
(1)25×125×32,
=25×125×8×4,
=(25×4)×(125×8),
=100×1000,
=100000;
(2)75×2.5+25×3.6,
=75×2.5+2.5×36,
=(75+36)×2.5,
=111×2.5,
=277.5;
(3)72×(
+3 8
),2 9
=72×
+72×3 8
,2 9
=27+16,
=43;
(4)
×5 16
×16×8,3 8
=(
×16)×(5 16
×8),3 8
=5×3,
=15.