Toán Lớp 9: Tính 5 căn 8 + 3 căn 18 – 3 căn 50
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Toán Lớp 9: Tính 5 căn 8 + 3 căn 18 – 3 căn 50
Comments ( 2 )
$ 5\sqrt[]{8} + 3\sqrt[]{18} – 3\sqrt[]{50} $
$ = 5 . 2\sqrt[]{2} + 3 . 3\sqrt[]{2} – 3 . 5 \sqrt[]{2}$
$ = 10\sqrt[]{2} + 9 \sqrt[]{2} – 15 \sqrt[]{2} $
$ = ( 10 + 9 – 15 ) . \sqrt[]{2} $
$ = 4\sqrt[]{2} $
#andy
\[\begin{array}{l}
5\sqrt 8 + 3\sqrt {18} – 3\sqrt {50} \\
= 10\sqrt 2 + 9\sqrt 2 – 15\sqrt 2 \\
= \left( {10 + 9 – 15} \right)\sqrt 2 \\
= 4\sqrt 2
\end{array}\]