x²-12y²=xy,且xy>0,则分式x+3y/2x-y的值为_______x2-12y2=xy,且xy>0,则分式x+3y/2x-y的值为_______
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x²-12y²=xy,且xy>0,则分式x+3y/2x-y的值为_______x2-12y2=xy,且xy>0,则分式x+3y/2x-y的值为_______x²-12y&
x²-12y²=xy,且xy>0,则分式x+3y/2x-y的值为_______x2-12y2=xy,且xy>0,则分式x+3y/2x-y的值为_______
x²-12y²=xy,且xy>0,则分式x+3y/2x-y的值为_______
x2-12y2=xy,且xy>0,则分式x+3y/2x-y的值为_______
x²-12y²=xy,且xy>0,则分式x+3y/2x-y的值为_______x2-12y2=xy,且xy>0,则分式x+3y/2x-y的值为_______
x²-xy-12y²=0
(x-4y)(x+3y)=0
x=4y,x=-3y
xy>0
所以x和y同号
所以x=4y
原式=(4y+3y)/(8y-y)=7y/7y=1
因式分解:x²-xy-12y²
若x²+xy-2y²=0,则x²+3xy+y²/x²+y²
x²+xy-2y²=0则x²+3xy+y²/x²+y²
x²-7xy+12y²=0{x²+4xy+4y²=14
(x²+y²)²-x²y²=(x²+y²)²-(xy)²=(x²+y²+xy)(x²+y²-xy)=(x+y)²(x-y)²-xy+xy=(x+y)²(x-y)²
已知x²y²+x²+y²=10xy-16 求x,y
已知X+Y=12,XY=9.求(X²+3XY+2Y²)÷(X²Y+2XY²)
3x²-y²=8x²+xy+y²=4
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已知x² -XY = 2,Y² -XY= 5,求x² - 4x Y+ Y² = 2x² + xY -3Y² = x² 已知x² -XY = 2,Y² -XY= 5,求x² - 4x Y+ Y² = 2x² + xY -3Y² = x² + xY- 2Y² =求x² - 4x Y+ Y² =
x²+xy=12 xy+y²=13求x²+y² 、 x四次方+y四次方
已知x、y是实数,且适合方程(x²+xy-12)²+(xy-2y²-1)²=0 求x、y的值
已知x、y是实数,且适合方程(x²+xy-12)²+(xy-2y²-1)²=0.求x、y的值.
若x² +xy+y² =14,x² -xy+y²=28求x+y的值
若x²+xy+y²=14,x²-xy+y²=28,求x+y的值