Question

Calcule as potências de expoente negativo. ​

Answer 1

Todo número elevado á um

expoente negativo vira fração;

$\boxed{\begin{array}{lr} 7^-^1=\dfrac{1}{7^1}=\dfrac{1}{7} \end{array}}\\\\\boxed{\begin{array}{lr} 5^-^2=\dfrac{1}{5^2}=\dfrac{1}{25} \end{array}}\\\\\boxed{\begin{array}{lr} (\frac{2}{3})^-^2=(\frac{3}{2})^2=\frac{9}{4} \end{array}}\\\\Em\ nu\´mero\ decimal,\ fica\ 9 \div 4 = 2,25$

$\boxed{\begin{array}{lr} 5^-^1=\dfrac{1}{5^1}=\dfrac{1}{5} \end{array}}$

Respostas;

$\boxed{\begin{array}{lr} a)=\dfrac{1}{7} \end{array}}\\\boxed{\begin{array}{lr} b)=\dfrac{1}{25} \end{array}}\\\boxed{\begin{array}{lr} c)=\dfrac{9}{4} \end{array}}\\\boxed{\begin{array}{lr} d)=\dfrac{1}{5} \end{array}}$

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