HOC24
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Bài học
x+1+x+2+x+3+.......x+100=5750
15+2\(^4\)+2\(^5\)+2\(^6\)+......+2\(^{2020}\)
\(\dfrac{1}{2}\)+\(\dfrac{5}{6}\)+\(\dfrac{11}{12}\)+\(\dfrac{19}{20}\)+\(\dfrac{29}{30}\)+\(\dfrac{41}{42}\)+\(\dfrac{55}{56}\)+\(\dfrac{55}{56}\)+\(\dfrac{71}{72}\)+\(\dfrac{89}{90}\)
tìm x,y biết \(\dfrac{1+3y}{12}\)=\(\dfrac{1+5y}{5x}\)=\(\dfrac{1+7y}{4x}\)