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nguyenxuantuantuu
2 năm trước
Cho a, b, c, d khác $0$ là 4 số phân biệt thỏa mãn $b^{2}$ = ac, $c^{2}$ = bd. Biết rằng $b^{3}$ + $c^{3}$ + $d^{3}$ khác $0$ . CMR $a^{3}$ + $b^{3}$ + $c^{3}$ / $b^{3}$ + $c^{3}$ + $d^{3}$ = $\frac{a}{d}$
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