问题
解答题
用简便方法计算. 0.25×64×1.25 17×
|
答案
(1)0.25×64×1.25,
=0.25×4×2×8×1.25,
=(0.25×4)×(8×1.25)×2,
=1×10×2,
=10×2,
=20;
(2)17×
÷2 3
×17,2 3
=17×
×2 3
×17,3 2
=(
×2 3
)×(17×17),3 2
=1×289,
=289.
用简便方法计算. 0.25×64×1.25 17×
|
(1)0.25×64×1.25,
=0.25×4×2×8×1.25,
=(0.25×4)×(8×1.25)×2,
=1×10×2,
=10×2,
=20;
(2)17×
÷2 3
×17,2 3
=17×
×2 3
×17,3 2
=(
×2 3
)×(17×17),3 2
=1×289,
=289.