49乘13+13的简便算
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49乘13+13的简便算
(25+125)乘8的简便算 541乘67—67乘441的简便算
(25+125)乘8的简便算 541乘67—67乘441的简便算
49*13+13 (25+125)*8
=13*(49+1) =25*8+125*8
=13*50 =200+1000
=650 =1200
541*67-67*441
=67*(541-441)
=67*100
=6700
=13*(49+1) =25*8+125*8
=13*50 =200+1000
=650 =1200
541*67-67*441
=67*(541-441)
=67*100
=6700