Question

(2+3x)(2-3x)

(2+3x)(2-3x)
(2x-5y)(2x+5y)
(-2m-1)(-2m+1)
(x^2-2y^2)(x^2+2y^2)
(-1/5x-2y)(-1/5x+2y)
(xy+3)(xy-3)
(x-4y)(x+4y)+16y^2
(-0.3x-0.2y)(0.3x-0.2y)
3x^2-(x+2y)(x-2y)
(3x-y)(-y-3x)-(x-2y)(-2y-x)
(x^2+y^n)(x^2-y^n)
(x+3)(x^2+9)(x-3)
(x-1)(2x-1)(x+1)(2x+1)

Answer 1

(2+3x)(2-3x)=4-9x^2
(2x-5y)(2x+5y)=4x^2-25y^2
(-2m-1)(-2m+1)=(-2m)^2-1=4m^2-1
(x^2-2y^2)(x^2+2y^2)=x^4-4y^4
(-1/5x-2y)(-1/5x+2y)=(-1/5x)^2-4y^2=1/25x^2-4y^2
(xy+3)(xy-3)=x^2y^2-9
(x-4y)(x+4y)+16y^2=x^2-16y^2+16y^2=x^2
(-0.3x-0.2y)(0.3x-0.2y)=(-0.2y)^2-(0.3x)^2=0.04y^2-0.09x^2
3x^2-(x+2y)(x-2y)=3x^2-(x^2-4y^2)=2x^2+4y^2
(3x-y)(-y-3x)-(x-2y)(-2y-x)=y^2-9x^2-(4y^2-x^2)=y^2-9x^2-4y^2+x^2=-8x^2-3y^2
(x^2+y^n)(x^2-y^n)=x^4-y^2n
(x+3)(x^2+9)(x-3)=(x^2-9)(x^2+9)=x^4-81
(x-1)(2x-1)(x+1)(2x+1)=(x^1-1)(4x^2-1)=4x^4-5x^2+1

追问

若m=x^2+y^2,且M·N=y^4-x^4,n=
谢啦

追答

n=(y^4-x^4)/(x^2+y^2)=(y^2+x^2)(y^2-x^2)/(x^2+y^2)=y^2-x^2.
你的题太多了，做的很辛苦，希望采纳。另外再提问吧。

Answer 2

一张披萨的魔力