1) 0,21
2) 11/16
3) 1/245
Объяснение:
1) 5^-1+10^-2= 1/5+1/10^2=0,21
2) (4/5)^-2+8^-1-(4,7)^0=(5/4)^2+1/8 -1= 11/16
3) (7/5)^-2 x 5^-3= (5/7)^2 x 1/5^3= 25/49 x 1/5^3= 5^2/49 x 1/5^3= 1/49 + 1/5= 1/245
