若圆B;x平方 y平方 2x 2y-8等于0与圆

(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)

a的平方(x-y)+b的平方(y-x)=(x-y)(a²－b²）=(x-y)(a+b)(a-b)(x的平方-2y)的平方-(1-2y)的平方=(x-2y+1-2y)(x-2y-1+

1,（x+y）²-x²y²＝(x+y)²-(xy)²=(x+y+xy)(x+y-xy)2,-2a立方b平方+8a平方b平方-8ab平方=-2ab

(3x平方-4y平方)+[-(x平方-2xy-y平方)]-[(3x平方-2xy-y平方)]=3x²-4y²-x²+2xy+y²-3x²+2xy+y&#

(x-y)^2-2(x-y)b+b^2=(x-y-b)^2.

∵A=4x²-4xy+y²B=x²+xy-5y²∴（3A-2B)-(2A+B)=3A-2B-2A-B=A-3B=4x²-4xy+y²-3(x

(a-b)+x平方(b-a)=(a-b)-x^2(a-b)=(a-b)(1-x^2)=(a-b)(1-x)(1+x)4M平方—（m+n)平方=(2m)^2-(m+n)^2=(2m-m-n)(2m+m+

4a²-(b+c)²=[2a+(b+c)][2a-(b+c)]=(2a+b+c)(2a-b-c)-4(x-2y)²+9(x+y)²=9(x+y)²-4

(x+y)(x-y)-y^2+(x-y)^2-(6x^2y-2xy^2)/(2y)=X^2-y^2-y^2+X^2+y^2-2xy-3x^2+xy=-x^2-y^2-xy=-(x^2+y^2+xy-3

(x-y-3)(x-y+2)(a+b+c)的平方

A=y的平方+xy—x的平方,B=y的平方-xy+2x的平方,所以A-B=y的平方+xy—x的平方-y的平方+xy-2x的平方=2xy-3x的平方,3A+2B=3y的平方+3xy—3x的平方+2y的平

4a(x-y)的平方-2b(y-x)的平方+(y-x)=4a(x-y)的平方-2b(x-y)的平方-(x-y)=(x-y)[4a(x-y)-2b(x-y)-1]=(x-y)(4ax-4ay-2bx+2

=(x+y)(x+y)(x^2-xy+y^2)(x^2-xy+y^2)=(x^3+y^3)^2

1、5a平方b（x-y）3次方-30ab平方（y-x）平方=5a²b(x-y)³-30ab(x-y)²=5ab(x-y)²[a(x-y)-6]=5ab(x-y)

a(x²+2xy+y²)-b（x²-y²）=a（x+y）²-b（x+y）（x-y）=（x+y）（ax+ay-bx+by）再问：你确定对吗？和我已开始算

x²-(x-y)²=[x+(x-y)][x-(x-y)]=y(2x-y)9a²-4(b+c)²=[3a+2(b+c)][3a-2(b+c)]=(3a+2b+2c

1.a=4b=7c=-12.系数是：-7分之派,次数是：43.2006X的三次方Y4.a平方-5a+65.(b+c)-(a-d)=b+c-a+d=(b-a)+(c+d)=-(a-b)+(c+d)=3+

3)5ax+7ay-5bx-7by=5ax-5bx+7ay-7by=5x(a-b)+7y(a-b)=(a-b)(5x+7y)(4)x的立方y+3x-2x的平方y的平方-6y=x³y-2x&#

x^2-4y^2-x+2y=(x^2-x+1/4)-1/4-(4y^2-2y+1/4)+1/4=(x-1/2)^2-(2y-1/2)^2=(x+2y+1)(x-2y)x^2-2x-b^2-2b=(x^

16X平方-25Y平方=(4x)²－(5y)²=(4x＋5y)(4x－5y)应该是a平方－b平方+2a-2b=（a＋b）（a－b）＋2（a－b）=(a－b)(a＋b＋2)4a（b-