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
a) \(\frac{53}{101}\cdot-\frac{13}{97}+\frac{53}{101}\cdot-\frac{84}{97}\)
\(=\frac{53}{101}\cdot\left(-\frac{13}{97}-\frac{84}{97}\right)\)
\(=\frac{53}{101}\cdot\left(-1\right)\)
\(=-\frac{53}{101}\)
