Find the cube of:(i) 7/9 (ii) -8/11(iii) 12/7 (iv) -13/8(v) \(2\f

1.	Find the cube of:(i) 7/9 (ii) -8/11(iii) 12/7 (iv) -13/8(v) \(2\frac{2}{5}\)(vi) \(3\frac{1}{4}\)
Answer» (i) 7/9 (7/9)³ = 7³/9³ = 343/729 (ii) -8/11 (-8/11)³ = -8³/11³ = -512/1331 (iii) 12/7 (12/7)3 = 12³/7³ = 1728/343 (iv) -13/8 (-13/8)3 = -13³/8³ = -2197/512 (v) \(2\frac{2}{5}\) (12/5)³ = 12³/5³ = 1728/125 (vi) \(3\frac{1}{4}\) (13/4)³ = 13³/4³ = 2197/64

Find the cube of:(i) 7/9 (ii) -8/11(iii) 12/7 (iv) -13/8(v) \(2\frac{2}{5}\)(vi) \(3\frac{1}{4}\)

Answer»

(i) 7/9

(7/9)³ = 7³/9³

= 343/729

(ii) -8/11

(-8/11)³ = -8³/11³

= -512/1331

(iii) 12/7

(12/7)3 = 12³/7³

= 1728/343

(iv) -13/8

(-13/8)3 = -13³/8³

= -2197/512

(v) \(2\frac{2}{5}\)

(12/5)³ = 12³/5³

= 1728/125

(vi) \(3\frac{1}{4}\)

(13/4)³ = 13³/4³

= 2197/64