Add `4a b ,\ -7a b ,\ -10 a b\ a n d\ 3a bdot`

Add 3a^2b ,\ 2a^2b ,\ 13 a^2b and a^2bdot

Add: a + b - 3, b - a + 3, a - b + 3

Find the angle between the pairs of lines with direction ratio proportional to: a ,\ b ,\ c\ a n d\ b-c ,\ c-a ,\ a-bdot

Add : 4a (a - b +c), 2b (a - b + c)

A B C D is a trapezium with parallel sides A B=a\ a n d\ D C=bdot If E\ a n d\ F are mid-points of non-parallel sides A D\ a n d\ B C respectively, then the ratio of areas of quadrilaterals A B F E\ a n d\ E F C D is: a : b (b) (a+3b):(3a+b) (3a+b):(a+3b) (d) (3a+b):(3a+b)

Add the following expressions: (i) 8a-6a b+5b ,\ -6a-a b-8b\ a n d-4a+2a b+3b (ii) 5x^3+7+6x-5x^2,\ 2x^2-8-9x ,\ 4x-2x^2+3x^3,\ 3x^3-9x-x^2\ a n d\ x-x^2-x^3-4

Add: 4/5\ a n d\ 7/(15)

Add: 6a + 8b - 5c, 2b + c - 4a and a - 3b - 2c.

If a in {2,4,6,9}a n d b in {4,6, 18 , 27} , then from the set of al ordered pairs (a , b) such that a divides b a n d b