làm bài 49 nha a,1/8-1/2 b,-11/12-(-1) c,3/5-5/6 d,-1/16-1/15 e,11/36–7/24 g,-5/9–5/12

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1. Hướng dẫn giải

   Câu a:

   1/8−1/2=1/8+(−1/2)

   =18+−48=−3/8

   Câu b:

   −11/12−(−1)=−11/12−(−12/12)

   =−11/12+12/12=112.

   Câu c:

    3/5−5/6=3/5+(−5/6)

   =18/30+(−25/30)=1/8+(−25)/30=−7/30.

   Câu d:

   −1/16−1/15=−1/16+(−1/15)

   =−15/240+(−16/240)=−31/240

   Câu e:

   11/36−(−7/24)=11/36+7/24

   =22/72+21//72=43/72                    

   Câu g

   −5/9−(−5/12)=−5/9+5/12

   =−20/36+15/36=−5/36

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2. $\text {a, $\frac{1}{8}$- $\frac{1}{2}$}$

   $\text {=$\frac{1}{8}$- $\frac{4}{8}$ }$

   $\text {=$\frac{-3}{8}$ }$

   $\text {b, $\frac{-11}{12}$- (-1) }$

   $\text {=$\frac{-11}{12}$+$\frac{12}{12}$ }$

   $\text {=$\frac{1}{12}$ }$

   $\text {c, $\frac{3}{5}$- $\frac{5}{6}$ }$

   $\text {=$\frac{15}{30}$ -$\frac{25}{30}$ }$

   $\text {=$\frac{-10}{30}$= $\frac{-1}{3}$ }$

   $\text {d, $\frac{-1}{16}$- $\frac{1}{15}$ }$

   $\text {=$\frac{-15}{240}$- $\frac{16}{240}$ }$

   $\text {=$\frac{-31}{240}$ }$

   $\text {e, $\frac{11}{36}$- $\frac{7}{24}$ }$

   $\text {=$\frac{22}{72}$- $\frac{21}{72}$ }$

   $\text {=$\frac{1}{72}$ }$

   $\text {g, $\frac{-5}{9}$- $\frac{5}{12}$ }$

   $\text {=$\frac{-20}{46}$- $\frac{15}{36}$ }$

   $\text {=$\frac{-35}{36}$ }$

   $\text {Chúc bạn học tốt~}$

    

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