tính tổng 1/1.2+1/2.3+1/3.4+………+1/199.200 10/09/2021 Bởi Eden tính tổng 1/1.2+1/2.3+1/3.4+………+1/199.200
$\dfrac{1}{1.2}+\dfrac{1}{2.3}+…+\dfrac{1}{199.200}$ $=1-\dfrac{1}{2}+\dfrac{1}{2}-\dfrac{1}{3}+\dfrac{1}{3}-…+\dfrac{1}{199}-\dfrac{1}{200}$ $=1-\dfrac{1}{200}$ $=\dfrac{199}{200}$ Bình luận
1/1×2+1/2×3+1/3×4+………..+1/199×200 =1-1/2+1/2-1/3+1/3-1/4+……………..+1/199-1/200 =1-1/200 =200/200-1/200 =199/200 nhớ vote 5 sao+câu trả lời hay nhất+cảm ơn Bình luận
$\dfrac{1}{1.2}+\dfrac{1}{2.3}+…+\dfrac{1}{199.200}$
$=1-\dfrac{1}{2}+\dfrac{1}{2}-\dfrac{1}{3}+\dfrac{1}{3}-…+\dfrac{1}{199}-\dfrac{1}{200}$
$=1-\dfrac{1}{200}$
$=\dfrac{199}{200}$
1/1×2+1/2×3+1/3×4+………..+1/199×200
=1-1/2+1/2-1/3+1/3-1/4+……………..+1/199-1/200
=1-1/200
=200/200-1/200
=199/200
nhớ vote 5 sao+câu trả lời hay nhất+cảm ơn