(x-2y+3)(x+2y+3)+(x+2y-3)²
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(x-2y+3)(x+2y+3)+(x+2y-3)²(x-2y+3)(x+2y+3)+(x+2y-3)²(x-2y+3)(x+2y+3)+(x+2y-3)²(x-2y+3
(x-2y+3)(x+2y+3)+(x+2y-3)²
(x-2y+3)(x+2y+3)+(x+2y-3)²
(x-2y+3)(x+2y+3)+(x+2y-3)²
(x-2y+3)(x+2y+3)+(x+2y-3)²
=[（x+3)-2y][(x+3)+2y]+(x+2y-3)²
=(x+3)²-4y²+[(x+2y)-3]²
=x²+6x+9-4y²+(x+2y)²-6(x+2y)+9
=x²+6x+9-4y²+x²+4xy+4y²-6x-12y+9
=2x²+18+4xy-12y
=[(x+3)-2y][(x+3)+2y]+[(x+2y)-3]²
=(x+3)²-4y²+(x+2y)²-6(x+2y)+9
=x²+6x+9-4y²+x²+4xy+4y²-6x-12y+9
=2x²+4xy-12y+18
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