计算(-a-b)^2+(a+1-2b)(a-1-2b)

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计算(-a-b)^2+(a+1-2b)(a-1-2b)
计算(-a-b)^2+(a+1-2b)(a-1-2b)

计算(-a-b)^2+(a+1-2b)(a-1-2b)
(-a-b)²+(a+1-2b)(a-1-2b)
=(a+b)²+(a-2b)²-1
=a²+2ab+b²+a²-4ab+4b-1
=2a²-2ab+5b²-1

(-a-b)²+(a+1-2b)(a-1-2b)
=(a+b)²+(a-2b+1)(a-2b-1)
=(a+b)²+(a-2b)²-1
=a²+b²+2ab+a²-4ab+4b²-1
=2a²-2ab+5b²-1

=(a+b)^2 +(a-2b)²-1
=a²+2ab+b²+a²-4ab+4b²-1
=2a²-2ab+5b²-1

(aΛb)*(a-2bΛ1)(a-2b-1)=(a*Λb*Λ2ab)Λ((a-2b)*-1)=2a*Λ5b*-2ab-1

=(a+b)(a+b)+[(a-2b)+1][(a-2b)-1]
=a^+2ab+b^+(a-2b)^-1
=a^+2ab+b^+a^-4ab+4b^-1
=2a^-2ab+5b^-1