cho ham so y=f(x) tinh f(4) bet f(x)=(x-1).f(x-1) va f(1)=1
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1. He has been learnt a lot about life in a farm
\(\Rightarrow\)He has been learn a lot about life in a farm
3. She asked me how I learm english in my country
\(\Rightarrow\)She asked me how I learn english in my country
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Ab có song song với EF . Vì cạnh AB và cạnh EF là 2 đoạn thẳng đối diện , song song vs nhau .
Mk ko chắc chắn đúng nên bạn cần lưu ý nhé .
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\(A=\left(\frac{1}{2^2}-1\right)\left(\frac{1}{3^2}-1\right)...\left(\frac{1}{100^2-1}\right)\)
\(-A=\left(1-\frac{1}{2^2}\right)\left(1-\frac{1}{3^2}\right)...\left(1-\frac{1}{100^2}\right)\)
\(-A=\frac{3}{4}\cdot\frac{8}{9}\cdot...\cdot\frac{9999}{10000}\)
\(-A=\frac{\left(1\cdot3\right)\left(2\cdot4\right)...\left(99\cdot101\right)}{\left(2\cdot2\right)\left(3\cdot3\right)...\left(100\cdot100\right)}\)
\(-A=\frac{\left(1\cdot2\cdot...\cdot99\right)\left(3\cdot4\cdot...101\right)}{\left(2\cdot3\cdot...\cdot100\right)\left(2\cdot3\cdot...\cdot100\right)}\)
\(-A=\frac{1\cdot101}{100\cdot2}\)
\(-A=\frac{101}{200}\)
\(A=\frac{-101}{200}\)