TVET CHNS,Eng,Maths
Senior High
求解過程講解，為什麼會用（n+1)✖️n✖️（n-1)？
学生裸白
設P=40xP",試求n之值責怕的不斷
(n+1)xnx(n-1)x(n-2)
=40xnx(n-1) n23
n
(n+1)x(n-2)-40-0
n²-n-42=0
(n-7)(n+6)=0
h=7orx
71-
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