Tính tích
A=(1-1/2010).(1-2/2010).(1-3/2010). ... .(1-2011/2010)
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Ta có:\(1-\frac{2010}{2010}=1-1=0\)
Tích A= (1-1/2010).(1-2/2010).(1-3/2010)....(1-2011/2010) chứa thừa số \(1-\frac{2010}{2010}=0\)
Vậy tích A=(1-1/2010).(1-2/2010).(1-3/2010)....(1-2011/2010)=0(Vì có chứa thừa số 0)
\(A=\left(1-\frac{1}{2010}\right).\left(1-\frac{2}{2010}\right).\left(1-\frac{3}{2010}\right).....\left(1-\frac{2011}{2010}\right)\)
\(A=\left(1-\frac{1}{2010}\right).\left(1-\frac{2}{2010}\right).\left(1-\frac{3}{2010}\right).....\left(1-\frac{2010}{2010}\right).\left(1-\frac{2011}{2010}\right)\)
\(A=\left(1-\frac{1}{2010}\right).\left(1-\frac{2}{2010}\right).\left(1-\frac{3}{2010}\right).....\left(1-1\right).\left(1-\frac{2011}{2010}\right)\)
\(A=\left(1-\frac{1}{2010}\right)\left(1-\frac{2}{2010}\right)\left(1-\frac{3}{2010}\right)....0.\left(1-\frac{2011}{2010}\right)\)
\(A=0\)
\(A=\left(1-\frac{1}{2010}\right).\left(1-\frac{2}{2010}\right).\left(1-\frac{3}{2010}\right)...\left(1-\frac{2011}{2010}\right)\)
\(A=\left(1-\frac{1}{2010}\right).\left(1-\frac{2}{2010}\right).\left(1-\frac{3}{2010}\right)...\left(1-\frac{2010}{2010}\right).\left(1-\frac{2011}{2010}\right)\)
\(A=\left(1-\frac{1}{2010}\right).\left(1-\frac{2}{2010}\right).\left(1-\frac{3}{2010}\right)...0.\left(1-\frac{2011}{2010}\right)\)
\(\Rightarrow A=0\)
( Vì 0 nhân với số nào cũng bằng 0 )
(1 + 2 + 3 + 4 + ... + 2010).(1 + 22 + 33 + ... + 20102010 + 20112011).(170170 - 7.11.13.170)
= (1 + 2 + 3 + 4 + ... + 2010).(1 + 22 + 33 + ... + 20102010 + 20112011).(170170 - 170170)
= (1 + 2 + 3 + 4 + ... + 2010).(1 + 22 + 33 + ... + 20102010 + 20112011). 0
= 0
\(\left(1-\frac{1}{2010}\right).\left(1-\frac{2}{2010}\right).\left(1-\frac{3}{2010}\right)...\left(1-\frac{2011}{2010}\right)\)
\(=\left(1-\frac{1}{2010}\right).\left(1-\frac{2}{1010}\right).\left(1-\frac{3}{2010}\right)....\left(1-\frac{2010}{2010}\right).\left(1-\frac{2011}{2010}\right)\)
\(=\left(1-\frac{1}{2010}\right).\left(1-\frac{2}{2010}\right).\left(1-\frac{3}{2010}\right)...\left(1-1\right).\left(1-\frac{2011}{2010}\right)\)
\(=\left(1-\frac{1}{2010}\right).\left(1-\frac{2}{2010}\right).\left(1-\frac{3}{2010}\right)...0.\left(1-\frac{2011}{2010}\right)\)
\(=0\)
A=\(\left(1-\frac{1}{2010}\right).\left(1-\frac{2}{2010}\right)...\left(1-\frac{2010}{2010}\right)\left(1-\frac{2011}{2010}\right)\)
A=\(\frac{2009}{2010}.\frac{2008}{2010}...0.\frac{-1}{2010}\)
A=0
Ta có : ( 1 + 2 + 3 +...+ 2010 ) . ( 1 + 2^2 + 3^3 + ... + 2010^2010 + 2011^2011 ) . ( 17017 - 7 . 11 . 13 . 17 )
= A . B . ( 17017 - 77 . 221 )
= A . B . ( 17017 - 17017 )
= A . B . 0
= 0
Tham khảo cách của mk nhé !