Tính: ( -5/8 + 7/6 -4/5 ) – ( 5/6 – 7/8 -7/5 ) + ( 3/4 +5/3 +12/5 )

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1. Đáp án:

    

   Giải thích các bước giải:

   ( -5/8 + 7/6 -4/5 ) – ( 5/6 – 7/8 -7/5 ) + ( 3/4 +5/3 +12/5 )

   = -5/8 + 7/6 -4/5 – 5/6 + 7/8 + 7/5 + 3/4 + 5/3 + 12/5

   =(-5/8 + 7/8 + 3/4) + (7/6 – 5/6 + 5/3) + (-4/5 + 7/5 + 12/5)

   =(-5/8 + 7/8 + 6/8) + (7/6 – 5/6 + 10/6) + 3

   =1 + 2 + 3

   =6

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2. Đáp án:

     $(\dfrac{-5}{8}+$ $\dfrac{7}{6}-$ $\dfrac{4}{5})-$ $(\dfrac{5}{6}-$ $\dfrac{7}{8}-$ $\dfrac{7}{5})+$ $(\dfrac{3}{4}+$ $\dfrac{5}{3}+$ $\dfrac{12}{5})=6$ 

   Giải thích các bước giải:

   $(\dfrac{-5}{8}+$ $\dfrac{7}{6}-$ $\dfrac{4}{5})-$ $(\dfrac{5}{6}-$ $\dfrac{7}{8}-$ $\dfrac{7}{5})+$ $(\dfrac{3}{4}+$ $\dfrac{5}{3}+$ $\dfrac{12}{5})$ 

   ${=}$ $\dfrac{-5}{8}+$ $\dfrac{7}{6}-$ $\dfrac{4}{5}-$ $\dfrac{5}{6}+$ $\dfrac{7}{8}+$ $\dfrac{7}{5}+$ $\dfrac{3}{4}+$ $\dfrac{5}{3}+$ $\dfrac{12}{5}$

   ${=}$ $(\dfrac{-5}{8}+$ $\dfrac{7}{8})+$ $(\dfrac{7}{6}-$ $\dfrac{5}{6})+$ $(\dfrac{-4}{5}+$ $\dfrac{7}{5}+$ $\dfrac{12}{5})+$ $\dfrac{3}{4}+$ $\dfrac{5}{3}$

   ${=}$ $\dfrac{1}{4}+$ $\dfrac{1}{3}+3+$ $\dfrac{3}{4}+$ $\dfrac{5}{3}$

   ${=}$ $(\dfrac{1}{4}+$ $\dfrac{3}{4})+$ $(\dfrac{1}{3}+$ $\dfrac{5}{3})+3$

   ${=1+2+3}$

   ${=6}$

    ~Xin hay nhất~

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