y＝3x的平方+2x从一般式转换到顶点式-搜答案-智慧作业帮

(x+y)的平方-2x-2y-3=(x+y)的平方-2(x+y)-3=(x+y-3)(x+y+1)

y是多少原式=(x+y)(x-y)/(x-y)²+x(y+3)/x(y+3)=(x+y)/(x-y)+1=(x+y+x-y)/(x-y)=2x/(x-y)=1/(1/2-y)再问：y=3

(3xy)平方/(-xy)+(x-2y)平方-(x+2y)(x-2y)=-9xy+(x-2y)(x-2y-x-2y)=-9xy+(x-2y)(-4y)=-9xy-4xy+8y²=8y

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)(

4/x-15x²y再问：朋友，发一下过程再答：3x²y-(-3x)²×(2y)+x³y²/(x²x²y²/4)=3x&#

（x+y）(x+2y)=x²+xy+2xy+2y²=x²+3xy+2y²

(x-2y+3z)^2-(x+2y-3z)^2=[x-2y+3z+(x+2y-3z)][x-2y+3z-(x+2y-3z)]=2x*(-4y+6z)=-8xy+12xz

原式=9x⁴/16y²*2y/3x+x²/2y²*x/2y²=3x³/8y+x³/4y⁴=(3x³y

3a(x-y)-2(y-x)^2=3a(x-y)-2(x-y)^2=(x-y)[3a-2(x-y)]=(x-y)(3a-2x+2y)

3(x-y)²*(y-x)²*2(x-y)=6(x-y)^(2+2+1)=6(x-y)^5再问：需要再详细一点的过程再答：3(x-y)²*(y-x)²*2(x-

y=-x²+8X-（X²-8X）=-（X²-8X+16)+16=-(X-4）²+16再问：y=8x-x的平方除以mm=8这个再答：不行未知正负情况再问：不可能不

解(x-y)(x+y)-(x-2y)²+x(3x-5y)-(x-y)(x-2y)=(x²-y²)-(x²-4xy+4y²)+(3x²-5xy

2x²-3x+5=0再问：那x（x-2）=1一般式怎么弄再答：x（x-2）=1x²-2x-1=0

5x=3y,x=3y/5(2x+y)的平方=5x(x+y)+94x²+4xy+y²=5x²+5xy+9x²+xy-y²+9=09y²/25+

原式=X²-9Y²-(X²-2XY-4Y²)-(4X²-4XY+Y²)=X²-9Y²-X²+2XY+4Y&su

先由两已知方程解得x=27/8,y=9/8,然后接下来的自己算啦...两方程的话,先将第二个两边都乘三,再于第一个相减得出y,再将y带进方程得x

1.(2x-3y)^2-(y+3x)(3x-y)=4x^2-12xy+9y^2-(3x+y)(3x-y)=4x^2-12xy+9y^2-9x^2+y^2=10y^2-5x^2-12xy2.[(x-y)

-2(x-y)^2-3(x-y)+5(y-x)^2+4(y-x)=-(x-y)(2x-2y+3)+(y-x)(5y-5x+4)=(y-x)(2x-2y+3)+(y-x)(5y-5x+4)=(y-x)(

(x+2)^2-(y-3)^2=(x+y)*(x-y)x^2+4x+4-y^2+6y-9=x^2-y^24x+6y-5=0即为所求的方程

(3x-y)的平方-(2x+y)的平方-5(x-y)=(3x-y+2x+y)(3x-y-2x-y)-5(x-y)=5x(x-2y)-5(x-y)=5x^2-10xy-5x+5y