展開(おきかえ)
次の式を計算しなさい
(a+b+1)(a+b+2) (x+y+3)(x+y-4) (x-y-2)(x-y-1) (a-2y-5)(a-2y+4) (x+y-1)2 (a+b+c)2 (a+2b+1)(a+2b-1) (x-2y+5)(x-2y-5) (a-b+3)(a+b-3) (x+2y+7)(x-2y-7)
解説リクエスト
(a+b+1)(a+b+2) (x+y+3)(x+y-4) (x-y-2)(x-y-1) (a-2y-5)(a-2y+4) (x+y-1)2 (a+b+c)2 (a+2b+1)(a+2b-1) (x-2y+5)(x-2y-5) (a-b+3)(a+b-3) (x+2y+7)(x-2y-7)