Câu hỏi của gheghdwhkwhwqhdhw,

Question

( 1+ 2/1 ) x ( 1+ 2/2 ) x ( 1+ 2/3 ) x ( 1+ 2/4 ) x ... x ( 1+ 2/26 ) x ( 1+ 2/27 )

Nguyễn Lê Phước Thịnh · Accepted Answer

$=\dfrac{3}{2}\cdot\dfrac{4}{2}\cdot\dfrac{5}{3}\cdot\dfrac{6}{4}\cdot...\cdot\dfrac{27}{25}\cdot\dfrac{28}{26}\cdot\dfrac{29}{27}$

$=\dfrac{1}{4}\cdot28\cdot29=7\cdot29=203$

Câu trả lời:

$=\dfrac{3}{2}\cdot\dfrac{4}{2}\cdot\dfrac{5}{3}\cdot\dfrac{6}{4}\cdot...\cdot\dfrac{27}{25}\cdot\dfrac{28}{26}\cdot\dfrac{29}{27}$

$=\dfrac{1}{4}\cdot28\cdot29=7\cdot29=203$