Toán Lớp 6: tính hợp lý : (-11/5 )+ 3/7 + 6/3 + 4/7 + (-2020/2021)
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Toán Lớp 6: tính hợp lý : (-11/5 )+ 3/7 + 6/3 + 4/7 + (-2020/2021)
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Giải đáp:
$(\dfrac{-11}{5})+\dfrac{3}{7}+\dfrac{6}{3}+\dfrac{4}{7}+(\dfrac{-2020}{2021})$
$= [(\dfrac{-11}{5})+2]+(\dfrac{3}{7}+\dfrac{4}{7})+(\dfrac{-2020}{2021})$
$= \dfrac{-1}{5}+1+\dfrac{-2020}{2021}$
$= \dfrac{4}{5}+\dfrac{-2020}{2021}$
$= \dfrac{-2016}{10105}$