Toán Lớp 9: √29-12 √5
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Toán Lớp 9: √29-12 √5
TÍNH NHANH HỘ MIK
THANKS
Comments ( 1 )
\sqrt {29 – 12\sqrt 5 } \\
= \sqrt {20 – 2.2.\sqrt 5 .3 + 9} \\
= \sqrt {{{\left( {2\sqrt 5 } \right)}^2} – 2.2\sqrt 5 .3 + {3^2}} \\
= \sqrt {{{\left( {2\sqrt 5 – 3} \right)}^2}} \\
= \left| {2\sqrt 5 – 3} \right|\\
= 2\sqrt 5 – 3
\end{array}$