Question

(-1/4X²Y)+(-3/8X²Y)+(-9/8x²y) e (+2/7ky) + (-3/14ky) + (1/7ky)

Answer 1

(-1/4x²y)+(-3/8x²y)+(-9/8x²y) =
-1/4x²y  -  3/8x²y  -  9/8x²y =   mmc 8
2.-1x²y/8 - 1.3x²y/8 - 1.9x²y/8 =
-2x²y  -  3x²y  -  9x²y / 8 =
-14x²y / 8

...

 (+2/7ky) + (-3/14ky) + (1/7ky) = 
  +2/7ky  - 3/14ky + 1/7ky =   mmc 14
  2.2ky/14 - 1.3ky/14 + 2.1ky/14 =
  4ky/14  -  3ky/14  +  2ky/14 =
  4ky - 3ky + 2ky / 14 =
  3ky /14