國中數學因式分解（3）?

只幫你算這題,其他的都差不多,可以自己想,才會進步
(x-9)^2-5x+45=(x-9)^2-5(x-9)=(x-9)(x-9-5)=(x-9)(x-14)
令x=114帶入得 (114-9)^2-5x114+45=(114-9)(114-14)=105x100=10500

(x-9)^2-5x+45
=(x-9)^2-5(x-9)
=(x-9)(x-9-5)
=(x-9)(x-14)

(114-9)^2-5*114+45
=(114-9)(114-14)
=105*100
=10500