20xy^2+y^2-x+20y^3+xy-y因式分解
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20xy^2+y^2-x+20y^3+xy-y因式分解20xy^2+y^2-x+20y^3+xy-y因式分解20xy^2+y^2-x+20y^3+xy-y因式分解1楼不对的.楼主等一下的额.慢慢说原式
20xy^2+y^2-x+20y^3+xy-y因式分解
20xy^2+y^2-x+20y^3+xy-y因式分解
20xy^2+y^2-x+20y^3+xy-y因式分解
1楼不对的.
楼主等一下的额.慢慢说
原式=20y³+20xy²+xy-x-y
= 20y²(x+y)+y(x+y)-(x+y)
=(x+y)(20y²+y-1)
=(x+y)(4y+1)(5y-1)
十字相乘(最后一步
先整理顺序..
得到(20xy^2+20y^3)+(xy+y^2)-(x+y)
因式分解得20y^2(x+y)+y(x+y)-(x+y)
=(x+y)(20y^2+y-1)
原式=y(20y^2+20xy+x+y)-(x+y)
=y(20y+1)(x+y)-(x+y)
=(x+y)(20y^2+y-1)
=20y^2(x+y)+y(y-1)+x(y-1)
=20y^2(x+y)+(y-1)(x+y)
=(x+y)(20y^2+y-1)
=(x+y)(4y+1)(5y-1)
x^2+xy+x=36,y^2+xy+y=20,求x+y.
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