Помогите пожалуйста срочно!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

1.а)7/20*15/17=7/4*3/17=21/61б)16/15:8/25=16/15*25/8=2/3*5=10/3в)(3/4)^3*(4/3)^3=(3/4*4/3)^3=1^3=1