Question

Tính nhanh: (66-1).(66-2).(66-3)...(66-98).(66-99)=?

Answer 1

Ta có:

(66-1).(66-2).(66-3)...(66-98).(66-99)

=(66-1).(66-2).(66-3)...(66-65).(66-66).(66-67)...(66-98).(66-99)

=(66-1).(66-2).(66-3)...(66-65).0.(66-67)...(66-98).(66-99)

Tích trên có 1 thừa số là 0=>Tích trên chỉ có thể bằng 0.

Vậy (66-1).(66-2).(66-3)...(66-98).(66-99)=0

Answer 2

65.64.63. ... (66-66) ... . (-32).(-33) = 0

Answer 3

\(\left(66-1\right)\left(66-2\right)\left(66-3\right)...\left(66-99\right)\)

\(=\left(66-1\right)\left(66-2\right)...\left(66-66\right)....\left(66-99\right)\)
\(=\left(66-1\right)\left(66-2\right)...0...\left(66-99\right)=0\)

mk !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Answer 4

Ta có:
(66-1).(66-2).(66-3)...(66-98).(66-99)
=(66-1).(66-2).(66-3)...(66-65).(66-66).(66-67)...(66-98).(66-99)

=(66-1).(66-2).(66-3)...(66-65).0.(66-67)...(66-98).(66-99)
Tích trên có 1 thừa số là 0=>Tích trên chỉ có thể bằng 0.
Vậy (66-1).(66-2).(66-3)...(66-98).(66-99)=0

~ Ủng hộ nha &&

Answer 5

Bằng 0 nha bạn

Answer 6

\(\left(66-1\right)\left(66-2\right)\left(66-3\right)...\left(66-99\right)\)

\(=\left(66-1\right)\left(66-2\right)...\left(66-66\right)...\left(66-99\right)\)

\(=\left(66-1\right)\left(66-2\right)...0...\left(66-99\right)=0\)