(0,25)^2÷(0,5)^2+(0,03)^2×(0,1)^2

(0,25)²:(0,5)²+(0,03)²×(0,1)²
= (25×100^(-1))²:(5×10^(-1))²+ (3×100^(-1))²×(10^(-1))²
= (5²×10^(-2))² : (5×10^(-1))² + (3×10^(-2))²×10^(-2)
= (5⁴×10^(-4)) : (5²×10^(-2)) + (3²×10^(-4)) × 10^(-2)
= 5² × 10^(-2) + 3² × 10^(-2)
= 10^(-2)(5²+3²)
= 10^(-2)(25+9)
= 10^(-2)(34)
= 34/100
= 0,34