Question

[1/5^-2+1/4^-2-1/4^-2]×5^2

Answer 1

Answer:

$((1 \div 5) { }^{ - 2} + (1 \div 4) {}^{ - 2} - (1 \div 4) ^{ - 2} ) \times 5 {}^{2} \\ = (25 + 16 - 16) \times 25 \\ = 25 \times 25 \\ = 625$