Toán Lớp 9: căn 125- 2 căn 20 – 3 căn 80+ 4 căn 45
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Toán Lớp 9: căn 125- 2 căn 20 – 3 căn 80+ 4 căn 45
Comments ( 2 )
\sqrt {125} – 2\sqrt {20} – 3\sqrt {80} + 4\sqrt {45} \\
= \sqrt {25.5} – 2.\sqrt {4.5} – 3.\sqrt {16.5} + 4.\sqrt {9.5} \\
= 5\sqrt 5 – 2.2\sqrt 5 – 3.4\sqrt 5 + 4.3\sqrt 5 \\
= 5\sqrt 5 – 4\sqrt 5 – 12\sqrt 5 + 12\sqrt 5 \\
= \sqrt 5
\end{array}$