tính nhanh a, 25-{-75} +32-{32+75} b, 5/13+-5/7+-20/41+8/13+-21/41

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1. $#Dino$

   `a) 25-(-75)+32-(32+75)`

   `=25+75+32-32-75`

   `=25`

   ……………………

   `b) 5/13+(-5)/7+(-20)/41+8/13+(-21)/41`

   `=5/13+8/13-10/41-21/41-5/7`

   `=1-1-5/7`

   `=0-5/7`

   `=-5/7`

    

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