3X+5Y=25① X+10Y=25②

已知x.x+y.y-6x-8y+25=0,求3x.x+5y的值 5(x-y)^3*[-6/25(y-x)^3][-2/3(y-x^4]= 方程组 5x+2y=25① 3x+4y=15② 已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) (4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuai 3x+4y=6①,x+2y=4② 2x+5y=16①,8x-7y=10② 25X+12Y=7 10X-18Y=-4 3X+8Y=26 5X-12Y=37 先化简再求值(x-y)(x+y)-(x-2y) 的完全平方+x(3x-5y)-(x-y)(x-2y),其中x=1/2 y (5x^4-10x^3y+25x^2y^2)除以(-5x^2)=_____________________ -10x^3y除以-5x^2+25x^2y^2除以-5x^2= 已知x^2+10xy+25y^2-1=0,化简x^3+5x^2y+x^2.. 实数x,y满足|2分之5x-y|+y²-10y+25=0,求代数式1-x-2y分之x-y÷x平方-y平方分之x