y(2x-y)平方 (y 2x)立方
来源:学生作业帮助网 编辑:作业帮 时间:2024/05/11 20:31:20
由题意得:x+y=0,即y=-x,代入方程组得:x+4=−x2x+x=a,解得:a=-6,x=-2.故答案为:-6.
∵x是y的2倍,∴x+4=y可化为2y+4=y,解得y=-4,∴x=2y=2×(-4)=-8,2a=2x-y=2×(-8)-(-4)=-16+4=-12,解得a=-6.故答案为:-6.
(x平方-y平方)/(x+y)+(x平方-2xy+y平方)/(x-y)=(x+y)(x-y)/(x+y)+(x-y)^2/(x-y)=x-y+x-y=2(x-y)
x^2=x的平方‘/’为除以[(x+2y)^2-(x+y)(x-y)-5y^2]/(2x)=[(x^2+4xy+4y^2)-(x^2-y^2)-5y^2]/(2x)=[4xy]/(2x)=2y[(3x
原式=x²-y²-(4x²y²+12xy²+9y²)=x²-y²-4x²y²-12xy²-
你好{x=2y(1)2x-y+z=2(2)x-2y+3z=-3(3)(2)*3-(3)5x-y=9(4)(1)代入(4)9y=9y=1x=2y=2把x=2,y=1代入(3)2-2+3z=3z=1所以方
题目比较简单,没有什么困难的地方,自己动脑筋做做,相信自己,比相信别人更重要.
2(y-x)²-7(x-y)+6(x-y)-3(y-x)²=-(y-x)²-(x-y)=-(x-y)²-(x-y)=-(x-y)[(x-y)+1]=(y-x)(
x=z-y2z-2y+3y=2+2z这里得出y=2x+2y+3z=14把y变成2x+4+3z=144z=12z就等于3了x=3-2得出x=1
(1)2x=3y(1)2x+y=7(2)把(1)代入(2)中,得4y=7,y=74.把y=74代入(1)中,得2x=214,x=218.所以原方程组的解为x=218y=74;(2)m−2(n−1)=0
设a=x-y,b=y-z,-a-b=z-x(y-z)平方+(x-y)平方+(z-x)平方=(y+z-2x)平方+(z+x-2y)平方+(x+y-2z)平方b^2+a^2+(-a-b)^2=(-a-b-
得(15+3y)/2+4y=2去分母等号两边同时乘以2得15+3y+8y=4得出y=-1
x+2y+4y^2/(x-2y)-4x^2y/(x-4y^2)=x+2y+4y^2/(x-2y)-4x^2y/[(x+2y)(x-2y)]通分,分母为[(x+2y)(x-2y)]=(x+2y)(x+2
(x-3y)(x+y)-(x-2y)(x+2y)-(x-y)平方=x²-2xy-3y²-x²+4y²-x²+2xy-y²=(x²-
(x-y)平方+2y(x-y)=(x-y)(x-y+2y)=(x-y)(x+y)
因为这3个函数图像交于一点所以2X-6=-1/2X-1=2/3X+m/3根据2X-6=-1/2X-1可得出X=2所以-1/2X-1=2/3X+m/3-2=4/3+m/3m=-10
1.(x-2y)(x+2y)=x平方-4y平方;(x平方+y)(x平方-y)=x四次方-y平方;所以(x-2y)(x+2y)-(x平方+y)(x平方-y)=x平方-4y平方-(x四次方-y平方)=x平
根据比例的基本性质,得2(3x-4y)=2x+y,4x=9y,则xy=94,故填94.
x8+256y8-32x4y4(用手机打的不要介意,给个最佳答案吧)
xy+y平方+x-y-2=xy+x+y^2-y-2=x(y+1)+(y+1)(y-2)=(y+1)(x+y-2)