(1)9(X-Y)^2-25 (2) (X^2-Y)^2-(2Y-2)^2(3)3X^6-3X^2 (4) (X+Y)^2-(Y-X)^2(5) (A^2-2B)^2-(1-2B)^2 (6) 9X^4-36Y^2

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(1)9(X-Y)^2-25 (2) (X^2-Y)^2-(2Y-2)^2(3)3X^6-3X^2 (4) (X+Y)^2-(Y-X)^2(5) (A^2-2B)^2-(1-2B)^2 (6) 9X^4-36Y^2
(1)9(X-Y)^2-25 (2) (X^2-Y)^2-(2Y-2)^2
(3)3X^6-3X^2 (4) (X+Y)^2-(Y-X)^2
(5) (A^2-2B)^2-(1-2B)^2
(6) 9X^4-36Y^2

(1)9(X-Y)^2-25 (2) (X^2-Y)^2-(2Y-2)^2(3)3X^6-3X^2 (4) (X+Y)^2-(Y-X)^2(5) (A^2-2B)^2-(1-2B)^2 (6) 9X^4-36Y^2
(1)9(X-Y)^2-25
原式=[3(X-Y)-5][3(X-Y)+5]
=(3X-3Y-5)(3X-3Y+5)
(2)(X^2-Y)^2-(2Y-2)^2
原式=[(X^2-Y)-(2Y-2)][(X^2-Y)+(2Y-2)]
=(X^2-Y-2Y+2)(X^2-Y+2Y-2)
=(X^2-3Y+2)(X^2+Y-2)
(3)3X^6-3X^2
原式=3X^2(X^4-1)
=3X^2(X^2-1)(X^2+1)
=3X^2(X-1)(X+1)(X^2+1)
(4) (X+Y)^2-(Y-X)^2
原式=[(X+Y)-(Y-X)][(X+Y)+(Y-X)]
=(X+Y-Y+X)(X+Y+Y-X)
=2X*2Y
=4XY
(5)(A^2-2B)^2-(1-2B)^2
原式=[(A^2-2B)-(1-2B)][(A^2-2B)+(1-2B)]
=(A^2-2B-1+2B)(A^2-2B+1-2B)
=(A^2-1)(A^2-4B+1)
=(A-1)(A+1)(A^2-4B+1)
(6) 9X^4-36Y^2
原式=(3X^2-6Y)(3X^2+6Y)
=3(X^2-2Y)*3(X^2+2Y)
=9(X^2-2Y)(X^2+2Y)

(1)
=(3(x-y))^2 - (5)^2
=(3x-3y-5)(3x-3y+5)
2
=(x^2-y-2y+2)(x^2-y+2y-2)
=(x^2-3y+2)(x^2-y-2)
3
=3x^2(x^4-1)=3x^2(x-1)(x+1)(x^2+1)
4
=(x+y-y+x)(x+y+y-x)=4xy
5
=(A^2-2B-1+2B)(A^2-2B+1-2B)=(A^2-1)(A^2+1)=(A+1)(A-1))(A^2+1)
6
=9(X^2+2Y)(X^-2Y))

(1)9(X-Y)^2-25
=(3X-3Y-5)(3X-3Y+5)
(2) (X^2-Y)^2-(2Y-2)^2
=(X^2-Y-2Y+2)(X^2-Y+2Y-2)
=(X^2-3Y+2)(X^2+Y-2)
(3)3X^6-3X^2
=3X^2(X^4-1)
=3X^2(X^2+1)(X+1)(X-1)
(4) (X+Y)^2-...

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(1)9(X-Y)^2-25
=(3X-3Y-5)(3X-3Y+5)
(2) (X^2-Y)^2-(2Y-2)^2
=(X^2-Y-2Y+2)(X^2-Y+2Y-2)
=(X^2-3Y+2)(X^2+Y-2)
(3)3X^6-3X^2
=3X^2(X^4-1)
=3X^2(X^2+1)(X+1)(X-1)
(4) (X+Y)^2-(Y-X)^2
=(X+Y+Y-X)(X+Y-Y+X)
=4XY
(5) (A^2-2B)^2-(1-2B)^2
=(A^2-2B+1-2B)(A^2-2B-1+2B)
=(A^2-4B+1)(A^2-1)
(6) 9X^4-36Y^2
=9(X^2+2Y)(X^-2Y)

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