[질문] DMZ8나수학 2008년꺼 18쪽이랑21쪽답 급해요~

01⑴(x-y)(a+b)⑵(a+b)(x-y+z)02⑴(x-4)(x-7)⑵(a+b+1)(a+b-2)⑶(a+b-2)(a-b)⑷4(x-6y)(x+y)03⑴(x-2y)(x+1)⑵(2a+1)(b-1)⑶(x+1)(x¤+1)04⑴(3x+y+1)(3x-y+1)