1.Tính: a. (-8).(-25) b. 19.202-9.202-2021 c. (3/7+3/5)-(3/5-4/7) d. 2/7.4/5+2/7:5/6+1/13

0 bình luận về “1.Tính: a. (-8).(-25) b. 19.202-9.202-2021 c. (3/7+3/5)-(3/5-4/7) d. 2/7.4/5+2/7:5/6+1/13”

1. a. (-8).(-25) = 8.25= 200

   b. 19.202-9.202-2021

   = 202(19-9) -2021

   = 202.10 -2021

   = 2020-2021

   =-1

   c. ( 3/7+3/5)-(3/5-4/7)

   = 3/7+3/5-3/5+4/7

   =3/7+4/7

   =7/7=1

   d. 2/7.4/5+2/7:5/6 +1/13

   =2/7.4/5+2/7.6/5 +1/13

   =2/7(4/5+6/5) +1/13

   =2/7 . 2 +1/13

   =4/7 + 1/13

   =59/91 

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