Question

一、225 + 4.8
I don’t understand it plz help
(And do it step by step...)

Answer 1

`\bf -√(225)+4.8~~ \begin{cases} 225=&3\cdot 3\cdot 5\cdot 5\\ &3^2\cdot 5^2\\ &(3\cdot 5)^2\\ &15^2 \end{cases}\\\\\\ -√(15^2)+4.8\implies -15+4.8\implies -10.2`