如何解35x+30(100-x)+40y+45(50-y)=5200
x(x-y)-y(y-x)+(x-y)²因式分解
已知x-y=1,y≠0,求{(x+2y)²+(2x+y)(x+4y)-3(x+y)(x-y)}÷y的值.
因式分解x²(x-2y)+y²(2y-x)
-{-[-(x-y)]}+{-[(x+Y)]}
y=5;x=14;y=((x=3*y,x+6),x-1); printf(''x=%d,y=%d'
(2/3x-2/x+y(x+y/3x-x-y))÷x-y/x,其中5x+3y=0
x²+y²-4x+6y+13=0,求(3x+y)²-3(3x+y)(x+y)-(x-3y)
计算:(1)2/(x+y)+4y/x²-y²(2)x²/x+y-x+y
分解因式(x+y)3次方-y(x+y)平方+x平方(y+x)
如果X的平方+Y的平方-4X-2Y+5=0,求(根X-根Y)的平方+4×根X×根Y/X+根X×根Y的值
① X/35=Y+0.6 ② X/50=Y-4/3
① X/45=Y+0.5 ② X/50=Y-0.5