Помогите а)4/5*8/9 в)1 8/25*3 4/15 г) 3 5/7*22/13 д) 2 2/3*9

Question

Помогите а)4/5*8/9 в)1 8/25*3 4/15 г) 3 5/7*22/13 д) 2 2/3*9

Answer 1

5/6 • 7/9 = (5•7) / ( 6•9 ) = 35/54 
11/28 • 7/33 = 7/( 28•3 ) = 1/( 4•3 ) = 1/12 
1 8/25 • 1 4/11 = 33/25 • 15/11 = ( 3•15) / 25 = ( 3 • 3 ) / 5 = 9/5 = 1 4/5 
2 2/3 • 6 = 8/3 • 6 = 8 • 2 = 16