(a^m-1+b^n+2)(a^m-1-b^n+2)=?

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(a^m-1+b^n+2)(a^m-1-b^n+2)=?(a^m-1+b^n+2)(a^m-1-b^n+2)=?(a^m-1+b^n+2)(a^m-1-b^n+2)=?平方差公式展开后得((a^m-1

(a^m-1+b^n+2)(a^m-1-b^n+2)=?
(a^m-1+b^n+2)(a^m-1-b^n+2)=?

(a^m-1+b^n+2)(a^m-1-b^n+2)=?
平方差公式展开后得((a^m-1)^2)-((b^n+2)^2)=a^2m -b^2n -2(a^m+b^n)-5