a] 4/9*x-2/3=1/5 b] -2/3*x+1/5=1/10 c] [9/2-2x]*1 và4/7=11/14 d] 5/7:x=-15/30

2 bình luận về “a] 4/9*x-2/3=1/5 b] -2/3*x+1/5=1/10 c] [9/2-2x]*1 và4/7=11/14 d] 5/7:x=-15/30”

1. Giải đáp:

    

   Lời giải và giải thích chi tiết:

    a) 4/9x-2/3=1/5

   4/9x=1/5+2/3

   4/9x=13/15

   x=13/15:4/9

   x=39/20

   Vậy x=39/20

   b) -2/3x+1/5=1/10

   -2/3x=1/10-1/5

   -2/3x=-1/10

   x=-1/10:(-2)/3

   x=3/20

   Vậy x=3/20

   c) (9/2-2x).1(4)/7=11/14

   (9/2-2x).11/7=11/14

   9/2-2x=11/14:11/7

   9/2-2x=1/2

   2x=9/2-1/2

   2x=4

   x=2

   Vậy x=2

   d) 5/7:x=-15/30

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

   5/(7x)=5/-10

   7x=-10

   x=-10/7

   Vậy x=-10/7

   Trả lời
2. a] 4/9xx x-2/3=1/5

   =>4/9xx x=1/5+2/3

   =>4/9xx x=13/15

   =>x=13/15:4/9

   =>x=39/20

   Vậy x=39/20

   b] -2/3xx x+1/5=1/10

   =>-2/3xx x=1/10-1/5

   =>-2/3xx x=-1/10

   =>x=-1/10:(-2/3)

   =>x=3/20

   Vậy x=3/20

   c] (9/2-2x)xx1 4/7=11/14

   =>9/2-2x=11/14:1 4/7

   =>9/2-2x=1/2

   =>2x=9/2-1/2

   =>2x=4

   =>x=4:2

   =>x=2

   Vậy x=2

   d] 5/7:x=-15/30

   =>x=5/7:(-15/30)

   =>x=-10/7

   Vậy x=-10/7

   Trả lời