Question

qual é o valor da expressão 40-(20+[2.(30-25)-8.2])

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Answer 1

$\boxed{\begin{array}{l}\underline{\rm Numa~express\tilde ao~num\acute erica}\\\underline{\rm resolve-se:}\\\sf 1\longrightarrow Pot\hat encias~e~ra\acute izes( na~ordem~que~vier)\\\sf 2\longrightarrow multiplicac_{\!\!,}\tilde ao~e~divis\tilde ao(na~ordem~que~vier)\\\sf 3\longrightarrow adic_{\!\!,}\tilde ao~e~subtrac_{\!\!,}\tilde ao(na~ordem~que~vier)\\\underline{\rm Al\acute em~disso~eliminamos:}\\\sf 1~\bigg(~~\bigg)\\\\\sf 2~\bigg[~~\bigg]\\\\\sf 3~\bigg\{~~\bigg\}\end{array}}$

$\boxed{\begin{array}{l}\sf 40-(20+[2\cdot(30-25)-8\cdot2])\\\sf 40-(20+[2\cdot5-16])\\\sf40-(20+[10-16])\\\sf 40-(20-6)=40-14=26\end{array}}$