1. Б)
2.
3. -10^2×0,6= -100×0.6=-60
4. 49×7^-3=7^2×7^-3=7^-1=1/7.
5.
1. 5^2÷5^-2= 625;
2. 5^-3×5^3= 1;
3. 5^0÷5^3= 1/125.
6. (3,6×10^-5)×(4×10^2)=(3,6×4)×(10^-5×10^2)=14,4×10^-3=1,44×10^-2.
7. (y^4×y^5)^2/y^15= (y^9)^2/y^15=y^18/y^15=y^3=-4/5^3=-64/125.