а)7,2*((7,2-6,4):2)=7,2*(0,8:2)=7,2*0,4=2,88
б)6,4:(7,2:6,4)=6,4:1,125=5,69
в)7,2+(7,2:6,4)=7,2+1,125=8,325
г) 7,2:6,4=1,125
а) 7,2*(7,2-6,4)/2 = 7,2*(0,8/2) = 7,2*0,4 = 2,88.
б) 6,4/(7,2/6,4) = 6,4/1,125 = 256/45=5,6(8).
в) 7,2 + (7,2/6,4) = 7,2 + 1,125 = 8,325.
г) 7,2/6,4 = 1,125.