Question

[hoanggibao796]

giup mik voi 

bai 1 tinh nhanh

\(\frac{53}{101}\)x \(\frac{-13}{97}\)+\(\frac{53}{101}\)x\(\frac{-84}{97}\)

(\(\frac{1}{57}\)- \(\frac{1}{5757}\)+ \(\frac{1}{23}\)) x ( \(\frac{1}{2}\)-\(\frac{1}{3}\)-\(\frac{1}{6}\))

( 1+\(\frac{1}{2}\)) ( 1+\(\frac{1}{3}\)) (1+\(\frac{1}{4}\)) ....(1+\(\frac{1}{2020}\))(1+\(\frac{1}{2021}\))

( 1-\(\frac{1}{2}\)) ( 1-\(\frac{1}{3}\))....(1-\(\frac{1}{199}\))(1-\(\frac{1}{200}\))

giup mik voi help me please huhu

Answer 1

[𝑮𝒊𝒂 𝑯𝒖𝒚]

a) \(\frac{53}{101}\cdot-\frac{13}{97}+\frac{53}{101}\cdot-\frac{84}{97}\)

\(=\frac{53}{101}\cdot\left(-\frac{13}{97}-\frac{84}{97}\right)\)

\(=\frac{53}{101}\cdot\left(-1\right)\)

\(=-\frac{53}{101}\)