Question

$4 - 90 ^{50} \div 90 ^{50}$
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Answer 1

$4 - 9 {}^{50} \div 9 {}^{50} \\ 4 - 1 = 3$

Answer 2

= 4-1 (pentru ca 90 la puterea 50 : la 90 l a puterea 50 e 1)=3