0 bình luận về “Môn Toán Lớp 6: 3/14 +-5/17 +11/14 +-29/17 4/11 .9/13-21/23 : 11/4 +4/11 5/7 . -4/19 +-15/7.5/19-2/7”

1. a 

   = ( 3/14 + 11/14 ) + [-5/17 + (-29/17)]

   =            1             +             (-2)

   =                            -1

   b 

   =4/11.9/13-21/13.4/11+4/11.1

   =4/11.( 9/13 -21/13 + 1)

   =4/11.           1/13

   =          4/143

   c

   =5/7 . (-4/19) +(-15/19) . 5/7 -2/7

   =5/7 . [-4/19 + (-15/19)]-2/7

   =5/7 .           (-1)            – 2/7

   =               -5/7              – 2/7

   =                 -1

   Trả lời
2. 3/14+{-5}/17+11/14+{-29}/17

   =(3/14+11/14)+({-5}/7+{-29}/17)

   =14/14+{-34}/17 =1+(-2)

   =-1

   ______________________________________

   4/11 . 9/13 – 21/23 : 11/4 + 4/11

   =4/11 . 9/13 – 21/23 . 4/11+4/11

   =4/11 . (9/13-21/23+1)

   =4/11 . (207/299-273/299+299/299)

   =4/11 . 233/199

   =932/3289

   _____________________________________

   5/7 . {-4}/19+{-15}/7 . 5/19 -2/7

   =5/7 . {-4}/19 + 5/7 . {-15}/19 – 2/7

   =5/7 . ({-4}/19+{-15}/19)-2/7

   =5/7 . {-19}/19 – 2/7

   =5/7 . (-1)-2/7

   =-5/7+{-2}/7

   =-7/7

   =-1

   #BaoNgoc

    

   Trả lời