a) 3/4 + 5/4 ÷ 3/8 – 1/2 b) 4/15 × X = 6/25 c) 7/6 – 1/6 × X = 2/3

2 bình luận về “a) 3/4 + 5/4 ÷ 3/8 – 1/2 b) 4/15 × X = 6/25 c) 7/6 – 1/6 × X = 2/3”

1. @Grey

   a)3/4+5/4:3/8-1/2

   =3/4+5/4xx8/3-1/2

   =3/4+10/3-1/2

   =9/12+40/12-6/12

   =43/12

   b)4/15xxx=6/25

   x=6/25:4/15

   x=6/25xx15/4

   x=9/10

   c)7/6-1/6xxx=2/3

   1/6xxx=7/6-2/3

   1/6xxx=7/6-4/6

   1/6xxx=1/2

   x=1/2:1/6

   x=1/2xx6/1

   x=3

    

   Trả lời
2. Giải đápLời giải và giải thích chi tiết:

   a) 3/4 + 5/4 : 3/8 – 1/2

   = 3/4 + 5/4 . 8/3 – 1/2

   = 3/4 + (10)/3 – 1/2

   = 3/4 – 1/2 + (10)/3

   = 1/4 + (10)/3

   = (43)/(12)

   ——————————-

   b) 4/(15) . x = 6/(25)

   => x = 6/(25) : 4/(15)

   => x = 6/(25) . (15)/4

   =>x = 9/(10)

   Vậy x = 9/(10)

   ——————————-

   c) 7/6 – 1/6 . x = 2/3

   => 1/6 x = 7/6 – 2/3

   => 1/6 x = 1/2

   =>x = 1/2 : 1/6

   => x =3

   Vậy x=3

   Trả lời