Câu hỏi của phan anh khôi

Question

(1+1)x(1+1/2)x(1+1/3)x(1+1/4)x...x(1+1/2020)  ai làm nhanh nhất 5 sao tick luôn

Nguyễn Thị Thương Hoài · Accepted Answer

A = (1+1) $\times$ (1+$\dfrac{1}{2}$) $\times$ (1+$\dfrac{1}{3}$) $\times$....$\times$(1+ $\dfrac{1}{2020}$)

A = 2 $\times$ $\dfrac{3}{2}$ $\times$ $\dfrac{4}{3}$ $\times$ $\dfrac{5}{4}$ $\times$.......$\times$ $\dfrac{2021}{2020}$

A =$\dfrac{2\times3\times4\times....\times2020}{2\times3\times4\times....\times2020}$ $\times$ $\dfrac{2021}{1}$

A = 1 $\times$ 2021

A = 2021Câu trả lời: A = (1+1) $\times$ (1+$\dfrac{1}{2}$) $\times$ (1+$\dfrac{1}{3}$) $\times$....$\times$(1+ $\dfrac{1}{2020}$)

A = 2 $\times$ $\dfrac{3}{2}$ $\times$ $\dfrac{4}{3}$ $\times$ $\dfrac{5}{4}$ $\times$.......$\times$ $\dfrac{2021}{2020}$

A =$\dfrac{2\times3\times4\times....\times2020}{2\times3\times4\times....\times2020}$ $\times$ $\dfrac{2021}{1}$

A = 1 $\times$ 2021

A = 2021