①(x+5)(x-6) ②(x+1)(x-30) ③(x-5)(x+6) ④(x-3)(x+10) ⑤(x+3)(x-10) ⑥(x+2)(x-15) ⑦(x-2)(x+15) ⑧同④ ⑨同① ⑩(x+3)(x-4)