(x+y)²=x²+2xy+y²(平方)那么(x+y)³=?(立方)
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(x+y)²=x²+2xy+y²(平方)那么(x+y)³=?(立方)
(x+y)²=x²+2xy+y²(平方)
那么(x+y)³=?(立方)
(x+y)²=x²+2xy+y²(平方)那么(x+y)³=?(立方)
x3+x2y+xy2+y3
已知(x²+y²)(x²+y²-6)+9=0 ,求x²+y²的值.
若x²+xy-2y²=0,则x²+3xy+y²/x²+y²
x²+xy-2y²=0则x²+3xy+y²/x²+y²
怎么算啊这个:X²+4X+Y²-2Y+5=0 则X²+Y²=?²²²²²²²²²²²²X²+4X+Y²-2Y+5X=0 则X²+Y²=?
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3x²-y²=8x²+xy+y²=4
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x²-4y² x+2y---------- ÷ --------分数线x²+2xy+y² x²+xyx²-4y² x+2y----------÷--------分数线x²+2xy+y² x²+xy(x+2y)(x-2y)x(x+y)=----------------(x+y)(x+y)(x+2y)(x-y)x=------(x+y)这样对了吗?