参考:【2(x-y)的3次方-8(x-y)的2次方(x+y)+6y(x-y)的平方】/2(x-y)的平方=?
【(x-y)的3次方-8(x-y)的2次方(x+y)+6y(x-y)的平方】/2(x-y)的平方
=(x-y)²[x-y-8(x+y)+6y]/2(x-y)²
=1/2(x-y-8x-8y+6y)
=1/2(-7x-3y)
=-3.5x-1.5y
参考:【2(x-y)的3次方-8(x-y)的2次方(x+y)+6y(x-y)的平方】/2(x-y)的平方=?
【(x-y)的3次方-8(x-y)的2次方(x+y)+6y(x-y)的平方】/2(x-y)的平方
=(x-y)²[x-y-8(x+y)+6y]/2(x-y)²
=1/2(x-y-8x-8y+6y)
=1/2(-7x-3y)
=-3.5x-1.5y