X:2=5
Vậy X bằng bn
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Answer:
\(\frac{1}{1.2}+\frac{1}{2.3}+\frac{1}{3.4}+...+\frac{1}{2021.2022}\)
\(=\frac{2-1}{1.2}+\frac{3-2}{2.3}+\frac{4-3}{3.4}+...+\frac{2022-2021}{2021.2022}\)
\(=\frac{1}{1}-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+...+\frac{1}{2021}-\frac{1}{2022}\)
\(=1-\frac{1}{2022}\)
\(=\frac{2021}{2022}\)
\(\frac{1}{1\times2}+\frac{1}{2\times3}+\frac{1}{3\times4}+...+\frac{1}{2021\times2022}\)
=\(\frac{1}{1}-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+...+\frac{1}{2021}-\frac{1}{2022}\)
=\(\frac{1}{1}-\frac{1}{2022}\)
=\(\frac{2021}{2022}\)
/HT\
\(1\frac{1}{8}\)= 1,125
Vậy chữ số hàng trăm là: 2
HT~
x=10 nhé em!!!
cách làm bài này là em lấy đpa sán là 5 rồi nhân với 2 là được nhé