Tìm x 3.(5-1/2x)+1/3=5/3 2.(3x+1)-3/4.(5-2x)=-1/3

2 bình luận về “Tìm x 3.(5-1/2x)+1/3=5/3 2.(3x+1)-3/4.(5-2x)=-1/3”

1. 3.(5 – 1/(2x) ) + 1/3 = 5/3

   3.(5 – 1/(2x) ) = 5/3 – 1/3

   5 – 1/(2x) = 4/3 : 3

   1/(2x) = 5 – 4/9

   1/(2x) = 41/9

   => 82x = 9

   x = 9/82

   Vậy x = 9/82

   —-

   2.(3x + 1) – 3/4.(5 – 2x) = -1/3

   6x + 2 – 15/4 + (6x)/4 = -1/3

   (6x + (6x)/4 ) + (2 – 15/4 + 1/3) = 0

   (15x)/2 -17/12 = 0

   (90x)/12 – 17/12 = 0

   =>90x – 17 = 0

   x= 17/90

   Vậy x=  17/90

   Trả lời
2. Giải đáp:

   3.(5-1/2x)+1/3=5/3

   =>3.(5-1/2x)=5/3-1/3

   =>3.(5-1/2x)=4/3

   =>5-1/2x=4/3:3

   =>5-1/2x=4/3. 1/3

   =>5-1/2x=4/9

   =>1/2x=5-4/9

   =>1/2x=45/9-4/9

   =>1/2x=41/9

   =>x=41/9: 1/2

   => x=41/9 .2

   =>x=82/9

   Vậy x=82/9

   ____________________

   2.(3x+1)-3/4.(5-2x)=-1/3

   =>6x+2-15/4+3/2x=-1/3

   =>(6x+3/2x)+(2-15/4)=-1/3

   =>(12/2x+3/2x)+(8/4-15/4)=-1/3

   =>15/2x+(-7/4)=-1/3

   =>15/2x=-1/3+7/4

   =>15/2x=-4/12+21/12

   =>15/2x=17/12

   =>x= 17/12: 15/2

   =>x=17/90

   Vậy x=17/90

    

   Trả lời