已知x-y=2,求x^2-2xy+y^2的值计算:(2m-n-1)^2
来源:学生作业帮助网 编辑:六六作业网 时间:2024/12/27 02:24:04
已知x-y=2,求x^2-2xy+y^2的值计算:(2m-n-1)^2已知x-y=2,求x^2-2xy+y^2的值计算:(2m-n-1)^2已知x-y=2,求x^2-2xy+y^2的值计算:(2m-n
已知x-y=2,求x^2-2xy+y^2的值计算:(2m-n-1)^2
已知x-y=2,求x^2-2xy+y^2的值
计算:(2m-n-1)^2
已知x-y=2,求x^2-2xy+y^2的值计算:(2m-n-1)^2
x^2-2xy+y^2=(x-y)^2=2^2=4
(2m-n-1)^2
=(2m)^2+(-n)^2+(-1)^2+2(2m)(-n)+2(-n)(-1)+2(2m)(-1)
=4m^2+n^2-4mn+2n-4m+1
x^2-2xy+y^2=(x-y)^2=4
x^2-2xy+y^2不就等于(x-y)^2……?等于4吧···
下面那个没明白什么意思
因为 x-y=2 所以x^2-2xy-y^2=(x-y)^2 因此 x^2-2xy+y^2=4
已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值?
已知:x(x-50y)+xy=50y^2,求:(x-y):y=?
已知x-xy=8,xy-y=-9,求x+y-2xy的值
已知x-2y=0,求(x/y-y/x)乘xy/x^2-2xy+y^2
已知x+y=-1,xy=-2,求代数式-5(x+y)+(x-y)+x(xy+y)的值
已知,x²+xy=14,y²+xy=2(x>y>0)求x+y.x-y
已知,x²+xy=14,y²+xy=2(x>y>0)求x+y.x-y
已知,x²+xy=14,y²+xy=2(x>y>0)求x+y.x-y
已知x/y=2,求2x(x+y)-y(x+y)/4x²-4xy+y²
已知X+Y=3XY,求2X+2Y-XY除以X+Y+2XY的值,要算理.已知X+Y=3XY,求2X+2Y-XY除以X+Y+2XY的值,要算理.
已知:x/y=-2,求x^2-2xy-3y^2/x^-6xy
已知xy=-2,x-y=3,求(x+y)(x-y)-y^2+(x-y)^2-(6x^2y-2xy^2)÷2y
已知X+y=6,xy=7 求x^2y+xy^2=已知X+y=6,xy=7 x^2y+xy^2
已知y=3xy+x,求代数式2x+3xy-2y/x-2xy-y的值
已知x+y=3xy,求2x+2y-xy/x+y+2xy的值、
已知x-y/xy=3,求分式2x+3xy-2y/x-2xy-y的值.
已知3/(x-y)=1/xy 求(-x-2xy+y)/ (2x+3xy-2y)
已知x-y=3xy,求2x+3xy-2y/x-2xy-y