^는제곱간주. 1.x(y+2)+2(y+2)=(x+2)(y+2) 2.{x-2y)(x+2y)}+(x+2y)=(x+2y)(x-2y+1) 3.(x+y)(x-y)+4(x+y)=(x+y)(x-y+4) 4,a²-(2b-3)²=(a-2b+3))(a+2b-3)임
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