Verify the following:
(i)`(-12)/(5)+(2)/(7)=(2)/(7)+(-12)/(5)`
(ii) `(-5)/(8)+(-9)/(13)= (-9)/(13)+(-5)/(8)`
(iii) `3+(-7)/(12)=(-7)/(12)+3`
(iv) `(2)/(-7)+(12)/(-35)=(12)/(-35)+(2)/(-7)`

Evaluate each of the following: (i) (-5)/(14)+(-2)/7 (ii) (13)/(15)-(12)/(25) (iii) (-6)/(13)-(-7)/(13)

Verify each of the following: (i) (3)/(7)xx(-5)/(7) = (-5)/(9)xx(3)/(7) (ii) (8)/(7) xx (13)/(9) = (13)/(9) xx (-8)/(7) (iii) (-12)/(5)xx (7)/(-36) = (7)/(-36) xx (-12)/(5) (iv) -8 xx (-13)/(12) = (-13)/(12)xx(-8)

2. Verify the following: -12/7 + 2/5 = 2/5 + -12/7

Add the following rational numbers : (i) (12)/(7) and (3)/(7) : (ii) (-2)/(5) and (1)/(5) (iii) (3)/(8) and (1)/(8) (iv) (-5)/(11) and (7)/(-11) (v) (9)/(-13) and (-11)/(-13) (vi) (-2)/(9) and (5)/(9) (vii) -(17)/(9) and (-11)/(9) (viii) (-3)/(7) and (5)/(-7)

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))

Evaluate : (iv) (3)/(8)+(-5)/(12)+(3)/(7)+(3)/(12)+(-5)/(8)+(-2)/(7)

Evaluate: 9-(13)/(7)-((2)/(7)-(12)/(5))

Simplify :(-2)/(3)+(5)/(9)-(-7)/(6)(ii)(5)/(12)+(-5)/(18)-(7)/(24)

5/4-7/6-(-2)/3=\ 3/4 (b) -3/4 (-7)/(12) (d) 7/(12)