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幼苗
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x平方(3x+5y)平方-y平方(5x+3y)平方
=x²(3x+5y)²-y²(5x+3y)²
=[x(3x+5y)]²-[y(5x+3y)]²
=[x(3x+5y)+y(5x+3y)]*[x(3x+5y)-y(5x+3y)]
=[3x²+5xy+5xy+3y²]*[3x²+5xy-5xy-3y²]
=[3x²+10xy+3y²]*[3x²-3y²]
=9[x²+10xy/3+y²]*(x+y)(x-y)
=9(x+y/3)(x+3)(x+y)(x-y)
=3(3x+y)(x+3)(x+y)(x-y)
1年前
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