2 tháng 3 2022 lúc 11:12
\(a.\dfrac{11}{17}+\left(\dfrac{-8}{19}\right)+\left(\dfrac{-3}{4}\right)+\dfrac{6}{17}-\dfrac{30}{19}\\ =\left(\dfrac{11}{17}+\dfrac{6}{17}\right)+\left(\dfrac{-8}{19}+\dfrac{30}{19}\right)+\left(\dfrac{-3}{4}\right)\\ =1+\dfrac{-38}{19}+\left(\dfrac{-3}{4}\right)=\dfrac{-38}{19}+\left(\dfrac{-3}{4}+1\right)\\ =\dfrac{-38}{19}+\dfrac{-1}{4}\\ =\dfrac{-9}{4}\)
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