(x+3+y)(x+3-y)=
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(x+3+y)(x+3-y)=
(3a+b-c)(3a-b+c)=
(x+y-4)(x+y+4)=
(a-2b-3)²=
(x-y+2)²=
(3a+b-c)(3a-b+c)=
(x+y-4)(x+y+4)=
(a-2b-3)²=
(x-y+2)²=
(x+3+y)(x+3-y)=(x+3)^2-y^2=x^2+6x+9-y^2
(3a+b-c)(3a-b+c)=(3a)^2-(b-c)^2=9a^2-b^2+2bc-c^2
(x+y-4)(x+y+4)=(x+y)^2-16=x^2+2xy+y^2-16
(a-2b-3)^2=a^2+4b^2+9-4ab-6a+12b
(x-y+2)^2=x^2+y^2+4-2xy+4x-4y
(3a+b-c)(3a-b+c)=(3a)^2-(b-c)^2=9a^2-b^2+2bc-c^2
(x+y-4)(x+y+4)=(x+y)^2-16=x^2+2xy+y^2-16
(a-2b-3)^2=a^2+4b^2+9-4ab-6a+12b
(x-y+2)^2=x^2+y^2+4-2xy+4x-4y
已知X-Y/X+Y=3,求代数式2(x-y)/X+Y-3X+Y/X+Y
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2=
先化简再求值(x-y)(x+y)-(x-2y) 的完全平方+x(3x-5y)-(x-y)(x-2y),其中x=1/2 y
(3x-y)^2+(3x+y)(3x-y),x=1,y=-2
{3(x+y)+3(y+x)=1,3(x+y)+4(y-x)=-1
x+y/2+x-y/3=6,4(x+y)-3(x-y)=-20
{(x+y)/2+(x-y)/3=6 4(x+y)-3(x-y)=-20
4(x+y)-3(x-y)=-20,2/x+y+3/x-y=6
(5x+3y)(3y-5x)-(4x-y)(4y+x)=
6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5
3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27