Tính:
1+2+3+.............+1000
A=(1+1999/1).(1+1992/2).(1+1999/3)...(1+1999/1000)/(1+1000/1).(1+1000/2).(1+1000/3)...(1+1000/1999)
Tính A
Tính nhanh A = (1000-1^3).(1000-2^3).(1000-3^3).................(1000-50^3)
Tính nhanh tổng sau:(1000-1^3).(1000-2^3).(1000-3^3)...........(1000-55^3)
dap an bang 0 ma minh khong biet cach trinh bay
(1000-1^3).(1000-2^3).(1000-3^3)...........(1000-55^3)
=(1000-1^3).(1000-2^3).(1000-3^3).......(1000-10^3)........(1000-55^3)
=(1000-1^3).(1000-2^3).(1000-3^3).......0........(1000-55^3)
=0
tính (1000-1^3).(1000-2^3).(1000-3^3...(1000-50^3)
Tính: (1000-1^3)*(1000-2^3)*........*(1000-50^3)
( 1000 - 13 ) . ( 1000 - 23 ) ... ( 1000 - 503 )
= ( 1000 - 13 ) . ( 1000 - 23 ) ... ( 1000 - 103 ) ... ( 1000 - 503 )
= ( 1000 - 13 ) . ( 1000 - 23 ) ... 0 ... ( 1000 - 503 )
= 0
Tính nhanh
(1000-1^3).(1000-2^3).(1000-3^3). ... .(1000-15^3)
=(1000-1^3).(1000-2^3).(1000-3^3)......(1000-10^3)....(1000-15^3)
=(1000-1^33).(1000-2^3).(1000-33).......0..........(1000-15^3) =0
\(\left(1000-1^3\right)\left(1000-2^3\right)\left(1000-3^3\right)...\left(1000-15^3\right)\)
\(=\left(1000-1^3\right)\left(1000-2^3\right)...\left(1000-10^3\right)...\left(1000-15^3\right)\)
\(=\left(1000-1^3\right)\left(1000-2^3\right)...\cdot0\cdot...\left(1000-15^3\right)\)
\(=0\)
tính B=[(1+2012/1)+(1+2012/2)+(1+2012/3)+...+(1+2012/1000)]:[(1+1000/1)+(1+1000/2)+...+(1+1000/2012)]
Tính
(1000—1^3).(1000—2^3)........(1000—50^3)
=(1000-13)(1000-23)...(1000-103)...(1000-503)
=(1000-13)(1000-23)...0....(1000-503)
=0
tính nhanh D=2009^(1000-1^3)(1000-2^3)...(1000-15^3)
D = 2009^(1000 - 1^3)...(1000-10^3)...(1000-15^3)
= 2009^(1000 - 1^3) .....0.(1000-15^3)
= 2009^0
= 1
Tính nhanh:
A=(1000-1^3).(1000-2^3)..........(1000-2010^3)
A = (1000-1^3) . (1000 - 2^3).........(1000 - 2010^3)
A = (1000 - 1^3)........(1000-10^3).........(1000 - 2010^3)
A = (1000 - 1^3)........... 0 ............. (1000 - 2010^3)
A = 0
A = ( 1000 - 1^3) .....(1000 - 10^3) ....
= (1000 - 1 ^3 )....(1000 - 1000)....
= (1000- 1)....0....
= 0