tìm x biết : 3/5 -1/4 – 1 1/8 = 9/20 -x + 11/-40

2 bình luận về “tìm x biết : 3/5 -1/4 – 1 1/8 = 9/20 -x + 11/-40”

1. 3/5 -1/4 – 1 1/8 = 9/20 -x + 11/-40

   3/5 -1/4 – 9/8 = 9/20 -x + 11/-40

   24/40-10/40-45/40=9/20 -x + 11/-40

   (24-10-45)/40=9/20 -x + 11/-40

   -31/40=9/20-x+11/-40

   9/20-x+11/-40=-31/40

   9/20-x=-31/40-11/-40

   9/20-x=-1/2

   x=9/20-(-1/2)

   x=9/20+1/2

   x=9/20+10/20

   x=(9+10)/20

   x=19/20

   Trả lời
2. #Zi_O

   3/5 -1/4 – 1 1/8 = 9/20 -x + 11/-40

   3/5 -1/4 – 9/8 = 9/20 -x + 11/-40

   24/40-10/40-45/40=9/20 -x + 11/-40

   (24-10-45)/40=9/20 -x + 11/-40

   -31/40=9/20-x+11/-40

   9/20-x+11/-40=-31/40

   9/20-x=-31/40-11/-40

   9/20-x=-1/2

   x=9/20-(-1/2)

   x=9/20+1/2

   x=9/20+10/20

   x=(9+10)/20

   x=19/20

    

   Trả lời