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125×81+375×27+405×25+1125×9
=125×81+125x3×27+405×25+25x45×9
=125×81x2+405x25+405x25
=20250+20250
=40500
=125×81+125x3×27+405×25+25x45×9
=125×81x2+405x25+405x25
=20250+20250
=40500
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2017-11-18
展开全部
125×81+375×27+405×25+1125×9
=125×9x9+125x3×3x9+5x9x9×25+125x9×9
=125x9x9x(1+1+1+1)
=125x81x4
=500x81
=40500
=125×9x9+125x3×3x9+5x9x9×25+125x9×9
=125x9x9x(1+1+1+1)
=125x81x4
=500x81
=40500
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展开全部
125×81+375×27+405×25+1125×9
=125*81+125*3*27+81*5*25+125*9*9
=125*81+125*81+81*125+125*81
=125*81(1+1+1+1)
=125*81*4
=125*4*81=500*81=40500
=125*81+125*3*27+81*5*25+125*9*9
=125*81+125*81+81*125+125*81
=125*81(1+1+1+1)
=125*81*4
=125*4*81=500*81=40500
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