-5/7. 2/11+ -5/7.9/11+ 5/7

2 bình luận về “-5/7. 2/11+ -5/7.9/11+ 5/7”

1. -5/7. 2/11 + (-5/7) . 9/11+ 5/7

   =5/7[(-1) . 2/11+(-1) . 9/11+1]

   =5/7[-2/11 + (-9/11) + 1]

   =5/7(-11/11 + 1)

   =5/7(-1+1)      

   =5/7 . 0=0

    

   Trả lời
2. -5/7. 2/11+ (-5/7). 9/11+ 5/7

   = 5/7 . -2/11 + 5/7.-9/11+5/7 . 1

   = 5/7 . (-2/11+$\dfrac{-9}{11}$ +1)

   = 5/7 . (-11/11 + 1)

   = 5/7 . (-1 + 1)

   = 5/7 . 0

   = 0

   Trả lời