4(x+y)∧2-25
4(x+y)∧2-25
1) (2x+5y)(2x-5y)(-4x^2-25y^2) 2) [(x+y)(x-y)-(x-y)^2+2y(x-y
已知X∧2+Y∧2-8X-6Y+25=0,求3X+4Y的值
已知X∧2 Y∧2-8X-6Y 25=0,求3X+4Y的值
x,y属于R*,且x+y=1,求证:(1)(x+1/x)(y+1/y)≥25/4 (2)(x+1/x)^2+(y+1/y
已知x.x+y.y+8x+6y+25=0,求代数式(x.x-4y.y)/(x.x+4xy+4y.y)-x/(x+2y)的
x^2-y^2/x+y-4x(x-y)+y^2/2x-y,
因式分解:4(x+y)^2+25-20(x+y)
20(x+y)+25+4(x+y)^2
4(x+y)^2+25-20(x+y)怎么解,
4(x+y)2+25-20(x+y) 因式分解
4(x+y)^2-20(x-y)+25