Question

Aflati nr de zerouri cu care se termină numarul: a) 2^23×5^7; b) 25^4÷16^2; c) 15^3×25×2^5;

Answer 1

a)2^23×5^7 =2^15×2^7×5^7 =2^15×10^7      7 zerouri

b) 25^4÷16^2= 5^8÷2^8=(5÷2)^8=(2,5)^8    numar zecimal

(daca in loc de ÷ era ×      25^4×16^2= 5^8×2^8=10^8    8 zerouri)


c) 15^3×25×2^5=3^3×5^3×5^2×2^5=3^3×5^5×2^5=3^3×10^5    5 zerouri