Tính :
\(\left(1-\dfrac{2}{2.3}\right).\left(1-\dfrac{2}{3.4}\right).\left(1-\dfrac{2}{4.5}\right)-.\left(1-\dfrac{2}{99.100}\right)\)
Tìm x biết :
\(\dfrac{1}{x}-\dfrac{y}{6}=\dfrac{1}{3}\)
m.n giúp mk nha !
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