(1)(x-y)² (9)5x(x-2y)² (2)(t+4)² (11)-(m-8)² (3)(5x-3)² (12)-7a(a+1)² (4)(2t+3)² (5)(x+2)²(6)(x-5)²(7)m(x+7)²(8)2(x-4)²亲。第十题的题目你是不是写错了?