Toán Lớp 9: căn 20 – 3 căn 18 – căn 45 + căn 72.Giúp mik vs
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Toán Lớp 9: căn 20 – 3 căn 18 – căn 45 + căn 72.Giúp mik vs
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=\sqrt{2^2 .5}-3\sqrt{3^2 .2}-\sqrt{3^2 .5}+\sqrt{6^2 .2}
=2\sqrt{5}-9\sqrt{2}-3\sqrt{5}+6\sqrt{2}
=-\sqrt{5}-3\sqrt{2}