2个回答
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333 x 666
=111x3x111x6
=111x111x3x6
=12321x3x6
=36963x6
=221778
(多位数乘多位数比较复杂,但多位数乘单位数就简单很多)
=111x3x111x6
=111x111x3x6
=12321x3x6
=36963x6
=221778
(多位数乘多位数比较复杂,但多位数乘单位数就简单很多)
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2016-03-15
展开全部
333×666
=111×3×111×6
=111²×18
=(100+11)²×18
=(100²+2×100×11+11²)×18
=(10000+2200+121)×18
=10000×18+2200×18+121×18
=180000+2200×(20-2)+121×(20-2)
=180000+(2200×20-2200×2)+(121×20-121×2)
=180000+(44000-4400)+(2420-242)
=180000+(44000-4000-400)+(2420-242)
=180000+40000-400+2178
=220000+1778
=221778
=111×3×111×6
=111²×18
=(100+11)²×18
=(100²+2×100×11+11²)×18
=(10000+2200+121)×18
=10000×18+2200×18+121×18
=180000+2200×(20-2)+121×(20-2)
=180000+(2200×20-2200×2)+(121×20-121×2)
=180000+(44000-4400)+(2420-242)
=180000+(44000-4000-400)+(2420-242)
=180000+40000-400+2178
=220000+1778
=221778
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