.n为å¥æ°æ¶
a(x-y)çn次æ¹-3b(y-x)çn+1次æ¹+2c(y-x)çn+2
=a(x-y)^nï¼3b(xï¼y)^(nï¼1)ï¼2c(xï¼y)^(nï¼2)
=(x-y)^n*[aï¼3b(xï¼y)ï¼2c(xï¼y)²]
=(x-y)^n*(aï¼3bxï¼3byï¼2cx²ï¼4cxyï¼2cy²)
2.å½n为å¶æ°æ¶
a(x-y)çn次æ¹-3b(y-x)çn+1次æ¹+2c(y-x)çn+2
=a(x-y)^nï¼3b(xï¼y)^(nï¼1)ï¼2c(xï¼y)^(nï¼2)
=(x-y)^n[aï¼3b(xï¼y)ï¼2c(xï¼y)²]
=(x-y)^n(aï¼3bxï¼3byï¼2cx²ï¼4cxyï¼2cy²)
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