若x的二次方减y的二次方等于48 x加y等于六则三x减三y等于多少
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由(1)x²-xy=5(2)y²+xy=-2∴(1)+(2)得:x²+y²=3.
x^2=y+4,所以x^2-y=4y^2=x+4,所以y^2-x=4x^3-2xy+y^3=(x^3-xy)+(y^3-xy)=x(x^2-y)+y(y^-x)=4x+4yx^2=y+4,y^2=x+
X2-4X+Y2+6Y+13=0(X-2)2+(Y+3)2=0∴有X-2=0,X=2Y+3=0,Y=-3
x*xy-4y=y(x^2-4)=y(x+2)(x-2)
化简可得3再问:怎么化简啊再答:(x2/y2)+(y2/x2)=[(xy+y2)/y2]+[(x2-xy)/x2]=(x/y)-(y/x)+2=[(x2-y2)/xy]+2=1+2=3化简可得3
8x的二次方-6y的二次方﹦146x的二次方﹢4y的二次方﹦38+14x的二次方-2y的二次方的值=52
x/y=3x=3y原式=[(3y)²+2*3y*y-3y²]/[(3y)²-3y*y+y²]=(9y²+6y²-3y²)/(9y&
(x-y)³×(x-y)²×(y-x)=(x-y)³×(x-y)²×[-(x-y)]=-(x-y)的6次方
3x²+2xy²+4x²y+xy²-4x²y=3x²+3xy²
x/y=-2则x=-2y则原式=(x²-2xy-3y²)/(x²-6xy-7y²)=(x+y)(x-3y)/(x+y)(x-7y)=(x-3y)/(x-7y)=
以上是完整的解答了,关键是完全平方公式和因式分解中的分组分解法的综合使用!
x²-y²=(x+y)(x-y)=6因为x+y=3所以(x+y)(x-y)/(x+y)=6/3x-y=2
再问:谢谢大神再答:有问题继续密我
原式=(x+y)(x-y)-3x-3y=(x+y)(x-y)-3(x+y)=(x+y)(x-y-3)
由(1)因式分(x+y)²-(x+y)³=(x+y)²(1-x-y)或者(2)计算:(x+y)²-(x+y)³=x²+2xy+y²
原式=8x^5y²/(-2x²y)-4x²y^5/(-2x²y)=-4x³y+2y³
x^2-4x(y+z)^2+4(y+z)^2=[x-2(y+z)]^2=(x-2y-2z)^2
赵易涵,回答如下,(X2+Y2)2-4X2Y2=(X2+Y2-2XY)(X2+Y2+2XY)=(x-y)^2*(x+y)^2=(x^2-y^2)^2.
x^2-xy=14xy-3y^2=2求x^2+3xy-3y^2因为x^2-xy=1所以x^2=1+xy带入原式得4xy+1-3y^2因为4xy-3y^2=2将其带入原式得2+1=3
解-(-x²)³×(-x²)²-x×(-x³)³——是这个吗=x^6×x^4-x×(-x^9)=x^10+x^10=2x^10