Toán Lớp 9: căn 3 ( 9 + 4 căn 5 ) + căn 3 ( 9 – 4 căn 5 )
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Toán Lớp 9: căn 3 ( 9 + 4 căn 5 ) + căn 3 ( 9 – 4 căn 5 )
Comments ( 1 )
A^3=9+4\sqrt{5}+9-4\sqrt{5}-3.\sqrt{(9+4\sqrt{5})(9-4\sqrt{5})}.A
A^3=18-3A
A^3+3A-18=0