x^2+y^2-8x+10x-1=0怎么因试分解和配方?我是求因试分解和配方，

y=2(x+1)(x-5)怎么化为y=2x²-8x-10 X^2-2XY+Y^2-X+Y-2=0怎么算等于(x-y-2)(x-y+1)? y=x+1/x(x>2)值域怎么求 已知x^2+y^2-8x+12y+52=0 ,求1/2x-1/x-y(x-y/2x-x^2+y^2) 已知x^2+y^2-8x+12y+52=0 ,求1/2x-1/x-y(x-y/2x-x^2+y^2) 怎么将y=x^-x/x^-x+1化简成（y-1）x^2+(1-y)x+y=0急 分解因式:(x+1)(x+2)(x+3)(x+4)+1已知x*x+2x+y*y-6y+10=0 求X的Y次方已知X和Y为相反数.且XY=-1/4 求代数式x*x*x*y+2x*x*y*y+x*y*y*y的值把第一题写清楚一点哦,另外请教下,幂怎么在电脑上打出来? {4x-3y-10=0 3x-2y=0,{3x-4(x-y)=2 2x-3y=1,{2(x+y)-(x-y)=3 (x+y)-2(x-y)=1 1、3x+2y=5 6x-5y=1 用带入消元法怎么写?[注意题格式也要写] 2、5x+2y=15 8x+3y=233、7x-3y=-1 4x-5y=-174、10x+3y=1=0 4x+5y+8=0 {x+y=1 ,xy=-6{x(2x-3)=0,y=x²-1{(3x+4y-3)(3x+4y+3)=0,3x+2y=5{(x-y+2)(x+y)=0,x²+y²=8{(x+y)((x+y-1)=0,(x-y)(x-y-1)=0 (2x+y+1)(2x+y-10)怎么做 (x/y)2-(x/y)=1怎么解? X^2Y+Y=X^怎么转换成X^=1-Y分之Y {2X=5(X+Y)3X-10(X+Y)=2怎么解? y=(x^3+x)/(x^2+1)是怎么化简成y=x 若x-y不等于0,2x-3y=0,则分式(10x-11y)/(x-y)的值是（）?(10x-11y)/(x-y) =[(8x-8y)+(2x-3y)]/(x-y) =8为什么8X-8Y=8？(10x-11y)/(x-y)=[(8x-8y)+(2x-3y)]/(x-y)=8+(2x-3y)]/(x-y)=8+0=8 mathematica软件,已知y[x],Y=f1(x),X(x)=f2(x),如何plot Y[X]?y[x_] := x + 9.81/2*x*xk=1X[x] = x - k*y'[x]/(1 + (y'[x])^2)^0.5Y[x] = y[x] + k/(1 + (y'[x])^2)^0.5Plot[{y[x],Y[X],},{x,0,2}] 已知x大于0,y大于0,且1/x+9/y=1,求x+y的最小值x+y=(x+y)*1=(x+y)*(1/x+9/y)=1+9+y/x+9x/y=10+y/x+9x/y 因为x,y∈(0,+∞) 运用基本不等式 这步怎么运用基本不等式呢 x+y=10+y/x+9x/y＞＝2√9+10=16 当且仅当y/x=9x/yy^2=9x^2