方程11x^2+2xy+9y^2+8x-12y+6=0 实数解(x,y)的个数为:个.
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方程11x^2+2xy+9y^2+8x-12y+6=0实数解(x,y)的个数为:个.方程11x^2+2xy+9y^2+8x-12y+6=0实数解(x,y)的个数为:个.方程11x^2+2xy+9y^2
方程11x^2+2xy+9y^2+8x-12y+6=0 实数解(x,y)的个数为:个.
方程11x^2+2xy+9y^2+8x-12y+6=0 实数解(x,y)的个数为:个.
方程11x^2+2xy+9y^2+8x-12y+6=0 实数解(x,y)的个数为:个.
方程11x^2+2xy+9y^2+8x-12y+6=0 实数解
即方程11x^2+(2y+8)x+9y^2-12y+6=0中x有 实数解
即根的判别式:(2y+8)^2-44(9y^2-12y+6)≥0
化简即98y^2-136y+50≤0
发现98y^2-136y+50=0时,y无解
即98y^2-136y+50≤0,y无解
所以x无解
所以实数解(x,y)的个数为:0 个
因为 11x^2 2xy 9y^2 8x-12y 6=0 有实数根
所以 11x^2 2(y 4)x (9y^2-12y 6)=0 的△≥0
即 4(y 4)^2 - 44*(9y^2-12y 6)≥0
解得:(7y-5)^2 ≤ 0 ,
所以 y = 5/7 (y有唯一的值)
故满足方程11x^2 2xy 9y^2 8x-12y 6=0的实数根对(x,y)的个数是1个。
已知x-xy=8,xy-y=-9,求x+y-2xy的值
化简分式方程:x*x-xy-y*y/x*x-3x-6y+2xy
方程11x^2+2xy+9y^2+8x-12y+6=0 实数解(x,y)的个数为:个.
解方程xy'=(√x^2-y^2)+y
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[ 2x-6y][8-9xy]÷xy等于?
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化简:3x^2-[5xy-(x^y-3xy)+4x^2y-8xy]
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因式分解:8(x-2y)-x(7x+y)+xy.
x+(9-8-y)=10 y+y-(9-8-y)=2 x-y=xx-9.9x xy=11y-1 y=? x=? x+y-xy=?x+(9-8-y)=10y+y-(9-8-y)=2x-y=xx-9.9xxy=11y-1 y=?x=?x+y-xy=?
化简:x-y/x+3y÷x^-y^2/x^2+6xy+9y^2-(xy/x+y)
(-x-y)(x^2+xy+y^2)
化简x^-y^/x^-2xy+y^
2*(x-y)²(y-x)(xy)
求x^3 - 6x^2y + 11xy^2 - 6y^3 思路x^3 - 6x^2y + 11xy^2 - 6y^3= x^3 - 3x^2y + 2xy^2 - 3x^2y + 9xy^2 - 6y^3= (x^2 - 3xy + 2y^2)(x - 3y)= (x^2 - 2xy - xy + 2y^2)(x - 3y)(x - y)(x - 2y)(x - 3y)求思路