Question

Tính:

\(\sqrt{91};\sqrt{49};\sqrt{12^2};\sqrt{\left(-4\right)^2}\)

 

Answer 1

\(\sqrt{91}\simeq9,54\)

\(\sqrt{49}=7\)

\(\sqrt{12^2}=12\)

\(\sqrt{\left(-4\right)^2}=4\)

Answer 2

\(\sqrt{91}\)≃9,54

\(\sqrt{49}\)=7

\(\sqrt{12^2}\)=12

\(\sqrt{\left(-4\right)^2}\)=-4