Question

calcule:
a) (+1/2x) +(-1/3x)

b)(-2/5x)+(-2/3x)

C)(-7/2y)+(+1/4y)

Answer 1

a) (+1/2x) +(-1/3x) =
      +1/2x - 1/3x =   mmc 6x
         3.1/6x - 2.1/6x =
         3/6x - 2/6x =
         1/6x

b)(-2/5x)+(-2/3x) =
    -2/5x  -  2/3x =   mmc 15x
     3.-2/15x - 5.2/15x =
     -6/15x - 10/15x =
     -16/15x

C)(-7/2y)+(+1/4y) =
    -7/2y  +  1/4y =  mmc 4y
    2.-7/4y  +  1.1/4y =
    -14/4y + 1/4y = 
    -14 +1/4y =
    -13/4y