Вычислите: a) 3/5 × 7/9, b) 4/11 × 3/4, v) 7/5 × 14/19, г) (3/5)^2.

a) (3/5) * (7/9) = 21/45 = 7/15, b) (4/11) * (3/4) = 12/44 = 3/11, v) (7/5) * (14/19) = 98/95, г) (3/5)^2 = 9/25.