小度小度99×999×3的简便算法怎么算?
4个回答
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不用叫小度,帮你解决。
99×999×3
=(100-1)x(1000-1)x3
=(100x1000-100x1-1000x1+1)x3
=(100000-100-1000+1)x3
=100000x3-100x3-1000x3+1x3
=300000-300-3000+3
=300000-3300+3
=296700+3
=296703
99×999×3
=(100-1)x(1000-1)x3
=(100x1000-100x1-1000x1+1)x3
=(100000-100-1000+1)x3
=100000x3-100x3-1000x3+1x3
=300000-300-3000+3
=300000-3300+3
=296700+3
=296703
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99×999×3
=99×(1000×3-3)
=99×2997
=100×2997-2997
=299700-2997
=296703
=99×(1000×3-3)
=99×2997
=100×2997-2997
=299700-2997
=296703
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