若x-y=-4,求x^2+y^2/2 -xy (注意是二分之x^2+y^2) 用乘法公式解
整式乘法公式已知X+Y=8,XY=12,求:(1)X方Y+XY方(2)X方-XY+Y方
已知x(x-1)-(x^2-y)=-3求(二分之y-x+2xy)-xy 快,
已知x-y=2,求二分之x²+y²-xy的值
解方程组:{二分之x+y+二分之x-y=6,4(x+y)-5(x-y)=2()
作乘法:(x+y)(x^2-xy+y^2);(x-y)(x^2+xy+y^2)
求3x²y-2xy²+2(xy-二分之三x²y)-xy+3xy²的值,其中x=3
(x+y)×(2x-y)用乘法公式算
若(x*x+y*y)(x*x+y*y)-4x*x*y*y=0,求代数式(x*x+5xy+y*y)/(x*x+2xy+y*
计算(x+2)(x^2-2x+4) (2x+y)(4x^2-2xy+y^2)后,求一乘法公式.
已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值?
x+y 3次方 公式是不是 = (x+y)(x^2-xy+y^2)?
已知x/y=2,求2x(x+y)-y(x+y)/4x²-4xy+y²