sms66 №1
1)84/10*(-57/10) = (-4788/100)=-47,88
2)  (-28/5)*(-25/21) = 4*5/3=20/3=6 целых 2/3
3) 2223/100*(-10/9) = -2223/90 = -247/10 = -24,7
4) -2898/100*(-1/14) = 207/100 = 2,07

tatsach ...........................