\(\frac{-1}{21}+\frac{-1}{28}=\frac{-4}{84}+\frac{-3}{84}=\frac{\left(-4\right)+\left(-3\right)}{84}=\frac{-7}{84}=\frac{-1}{12}\)
3/14 : 1/28 -13/21 :1/28 + 29/42 : 1/28 - 8 = ?
c=3/14:1/28-13/21:1/28+29/42:1/28-8
\(C=\dfrac{3}{14}:\dfrac{1}{28}-\dfrac{13}{21}:\dfrac{1}{28}-\dfrac{29}{42}:\dfrac{1}{28}-8\)
\(\text{c) \dfrac{3}{14} : \dfrac{1}{28} - \dfrac{13}{21} : \dfrac{1}{28} - \dfrac{29}{42} : \dfrac{1}{28} - 8}\)
3/14:1/28-13/21:1/28+29/42:1/28-8
giúp mik vs mấy bn ơi! chỉ cách lm ak
-1/21+( -1)/28=?
-1/21+-1/28=?
tính M = -1/21+-1/28
S=(1-1/21)*(1-1/28)*(1-1/36)...(1-1/1326)