Question

найти значение выражений   5²¹ × 5⁻²³ =    

3⁻⁸  ÷ 3⁻⁹ =


( 2 )⁻³ =


          

Answer 1

$5 ^{21} *5 ^{-23} =5 ^{21+(-23)} =5 ^{-2} = frac{1}{5^{2} } = frac{1}{25} = frac{4}{100} =0.04 \ \ frac{3 ^{-8} }{3^{-9} } =3 ^{-8-(-9)} =3 ^{-8+9} = 3^{1} =3 \ \ (2) ^{-3} = frac{1}{2^{3} } = frac{1}{8} = frac{125}{1000} =0.125$