(x-y)²-6x平方 6y平方 9乘x-y的差的平方-搜答案-智慧作业帮

x^2+y^2=6y-4x-13x^2+4x+4+y^2-6y+9=0(x+2)^2+(y-3)^2=0x=-2y=3x^2-y^2=(-2)^2-3^2=4-9=-5

约分6x的平方y/2y的平方=3x^2/y

(x+y)^2-6x^2+6y^2+9(x-y)^2=x^2+2xy+y^2-6x^2+6y^2+9x^2-18xy+9y^2=4x^2-16xy+16y^2=4(x^2-4xy+4y^2)=4(x-

=(6x³y²-18x²y³+27x^6y³)/(3x²y²)=6x³y²/(3x²y²)

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)(

6(x-y)的三次方+12(x-y)的平方-3(y-x)的平方=6(x-y)³+12(x-y)²-3(x-y)²=6(x-y)³+9(x-y)²=3(

(x平方+y平方)平方-y平方=x平方+6所以（x²＋y²）²-（x²＋y²）-6=0（x²＋y²＋2）（x²＋y

x²－4x＋y²＋6y＋13＝0﹙x²－4x＋4﹚＋﹙y²＋6y＋9﹚＝0﹙x－2﹚²＋﹙y＋3﹚³＝0x－2＝0,x＝2y＋3＝0,y＝﹣

3(x-2y)-x²y(2y-x)=3(x-2y)+x²y(x-2y)=(x-2y)(3+x²y)

x^2-6x+9-y^2=(x-3)^2-y^2=(x-3+y)(x-3-y)=(x+y-3)(x-y-3)

原式=-y(9x²-6xy+y²)=-y(3x-y)²

（x+y)(x-y)+(x-y)的平方-(6X的平方Y-2XY的平方）/2Y=x²-y²+x²-2xy+y²-3x²+xy=-x²-xy

【2（x-y）²-8（x-y)²（x+y）+6y（x-y）²】÷2（x-y）²=2（x-y）²÷2(x-y)²-8（x-y)²（x

X²-XY-6Y²+2X-Y+1=(X+1)²-Y(X+1)-6Y²=(X+1-3Y)(X+1+2Y)再问：学生不才老师您第一步我就不知道怎么得到的再答：X2-

[(3x-3y)/(y平方-x平方)+(x平方-2xy+y平方)/(x平方-y平方)-(x平方-x+6)/(x+2)]/(x+y)=【-3/(x+y)+(x-y)/(x+y)-(x-3)]】/(x+y

∵x²-y²=12∴(x+y)(x-y)=12∵x+y=6…………①∴x-y=2…………②①+②得2x=8x=4把x=4代入①得4+y=6y=2∴x=4,y=2很高兴为您解答,祝你

x^2+y^2+4x-6y+13=0(x^2+4x+4)+(y^2-6y+9)=0(x+2)^2+(y-3)^2=0因为(x+2)^2和(y-3)^2都是非负数,所以：(x+2)^2=0(y-3)^2

（6x+2y)/(9x-3y)=6(6x/y+2)/(9x/y-3)=6,解得：x/y=5/12(3x+y)^2/(x^2-y^2)=(3x/y+1)^2/((x/y)^2-1)=(81/16)*(2

（x+y)的平方-6x的平方+6y的平方+9(x-y)的平方=(x+y)²-6(x²-y²)+9(x-y)²=(x+y)²-6(x+y)(x-y)+9