(-5/7):(-5/7)^39+0,5^19.2^20-1^43-|-25/49|

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1. Giải thích các bước giải:

   $(\dfrac{-5}{7}):(\dfrac{-5}{7})^{39}+0,5^{19}.2^{20}-1^{43}-|\dfrac{-25}{49}|$ 

   $=(\dfrac{-5}{7})^{1-39}+0,5^{19}.2^{19}.2-1-\dfrac{25}{49}$ 

   $=(\dfrac{-5}{7})^{-38}+(2.0,5)^{19}.2-1-\dfrac{25}{49}$ 

   $=(\dfrac{5}{7})^{-38}+1^{19}.2-1-\dfrac{25}{49}$ 

   $=(\dfrac{7}{5})^{38}+2-1-\dfrac{25}{49}$ 

   $=(\dfrac{7}{5})^{38}+1-\dfrac{25}{49}$ 

   $=(\dfrac{7}{5})^{38}+\dfrac{49-25}{49}$ 

   $=(\dfrac{7}{5})^{38}+\dfrac{24}{49}$ 

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