4x+8y=5(x+y)
2x^2y×(-8y^2)+4x^2y×5y^2
(x-y)7÷(y-x)4+(-x-y)8÷(x+y)5.
(3x-4y)(5x-4y)-(7x-8y)(6y-5x)
1.((y+2x)(-2x+y)+4(x+2y)^2)/3y 2.(2(x-y)^3-8(x-y)^2(x+y)+6y(
计算(x^8-x^7y+x^5y^3-x^4y^4+x^3y^5-x^y^7+y^8)(x^2+xy+y^2)
x^8-x^7y+x^6y^2-x^5y^3+x^4y^4-x^3y^5+x^2y^-xy^7+y^8
2(x-y)+3(x+y)2-5(x-y)-8(x+y)2-(x-y)
已知x,y为实数,且2(x+2y)=x²+y²+5求代数式3x-4y分之x²+y²
利用关系式判断,y和x成什么比例 8x=y( ) x/4=y( ) y/8=5/x( ) 1/x=y( )
若实数x、y满足x平方+y平方-4x-2y+5=0,求根号8y-2x分之(根号x)+y
(4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuai
(3x-y)²-2x(4x-5y)-(x+2y)²