为什么3x^2+11xy+10y^2=(3x+5y)(x+2y)
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为什么3x^2+11xy+10y^2=(3x+5y)(x+2y)为什么3x^2+11xy+10y^2=(3x+5y)(x+2y)为什么3x^2+11xy+10y^2=(3x+5y)(x+2y)3x^2
为什么3x^2+11xy+10y^2=(3x+5y)(x+2y)
为什么3x^2+11xy+10y^2=(3x+5y)(x+2y)
为什么3x^2+11xy+10y^2=(3x+5y)(x+2y)
3x^2+11xy+10y^2
=3x^2+6xy+5xy +10y^2 11xy 折成两项
=3x(x+2y)+5y(x+2y) 分组分解
=(3x+5y)(x+2y)
3x^2+11xy+10y^2=(3x+5y)(x+2y)
^^
为什么3x^2+11xy+10y^2=(3x+5y)(x+2y)
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