`(1)/(5)times(11)/(13)+7(4)/(5)times(1)/(13)=`

(1(1)/(13)times2(3)/(5))-:(7(1)/(2)times3(1)/(10))-:(28)/(279)

(13)/(25)times 1 (7)/(8)

(7)/(8)times((17)/(13)+(14)/(13))=((7)/(8)times(14)/(13))+((7)/(8)times .....)

(1)/(1times3)+(1)/(3times5)+(1)/(5times7)+(1)/(7times9)+(1)/(9times11)+(1)/(11times13)

Verify each of the following: (i) ((5)/(7)xx (12)/(13))xx(7)/(18)= (5)/(7) xx ((12)/(13)xx(7)/(18)) (ii) (-13)/(24)xx((-12)/(5)xx(35)/(36))=((-13)/(24)xx(-12)/(5))xx (35)/(36) (iii) ((-9)/(5)xx (-10)/(3)) xx (21)/(-4) = (-9)/(5) xx ((-10)/(3) xx (21)/(-4))

Find the reciprocal (multiplicative inverse) of : (i) (3)/(5)xx(2)/(3) (ii) (-8)/(3)xx(13)/(-7) (iii) (-3)/(5)xx(-1)/(13)

((1)/(1xx4)+(1)/(4xx7)+(1)/(7xx10)+(1)/(10xx13)+(1)/(13xx16))=?

Harmonic conjugate of the point (5,13) with respect to (2,-5) and (3,1) is (1,(13)/(5))(b)((13)/(5),1)((13)/(5),(7)/(5)) (d) (-(7)/(5),(13)/(5))