Tính tích :
( 1 + 7/9 ) . ( 1 + 7/20 ) . ( 1 + 7/33 ) ........ ( 1 + 7/2900 )
1-tính tích
p=(1+7/9)(1+7/20)(1+7/33)...(1+7/2900)
Ta có :( 1 + 7/9 ) x ( 1 + 7/20 ) x ( 1 + 7/33 ) x...x ( 1 + 7/2900)
= (8x2)/(9x1) x (9x3)/(10x2) x (10x4)/(11x3) x...x (57x51)(58x50)
=(8x2x9x3x10x4x...x57x51) / (9x1x10x2x11x3x...x58x50)
Sau khi giản ước ta được :
= (8x51) / (1x58) = 204/29
Tính: A=(1+7/9)*(1+7/20)*(1+7/33)*..........*(1+7/2900)
Tính nhanh :
A = ( 1 + 7/9 ).(1+7/20).(1+7/33 )....( 1 + 7/2900 )
Tính P=(1+7/9).(1+7/20).(1+7/33)...(1+7/2900)
Tính và so sánh:
a. A= ( 1+7/9)(1+7/20)(1+7/33).............(1+7/2900) với 7
tính
a=(1+(7/9))x(1+(7/20))x(1+(7/33))x...........x(1+(1/2900))
(1+7/9)*(1+7/20)*(1+7/33)*...*(1 + 7/2900) = ?
tính tích P=[1+\(\frac{7}{9}\)].[1+\(\frac{7}{20}\)].[1+\(\frac{7}{33}\)]...[1+\(\frac{7}{2900}\)]
chứng minh rằng :(1+7/9)(1+7/20)(1+7/33).......(1+7/2900)=7 1/29