Помогите срочно нужно !!!!!! #648 (2,4) #649(2,4,6)

648

2) 8b - 3 5/9b = 8 * 3/5 - 3 5/9 * 3/5 = 24/5 - 32/9 * 3/5 = 24/5 - 32/15 = 72/15 - 32/15 = 40/15 = 8/3 = 2 2/3

4) 2 5/8b + 3 1/4b = 2 5/8 * 2 2/3 + 3 1/4 * 2 2/3 = 21/8 * 8/3 + 13/4 * 8/3 = 7 + 26/3 = 7 + 8 2/3 = 15 2/3

649

2) (1 1/2)³ + 5/8 = (3/2)³ + 5/8 = 27/8 + 5/8 = 32/8 = 4
4) (1/2)⁴ + 3 1/4 = 1/16 + 13/4 =1/16 + 52/16 = 53/16 = 3 5/16
6) 9 - (1 1/3)² = 9 - (4/3)² = 9 - 16/9 = 81/9 - 16/9 = 65/9 = 7 2/9