Cho , là hai số thực khác 0 thỏa mãn . Tỉ số bằng

Giải thích

Ta có ⇔ - 3 a 2 + 4 a b = 4 3 3 a 2 - 10 a b ⇔ 4 3 a 2 - 10 a b + 9 a 2 + 4 a b = 0 " src="https://img-question-vn.ruangguru.com/NhNyNyrsyOoyi0jQ2vG_ujr_xBLNC1X2VzsoVXyY3iTtJYN1ZuWAkGGKacL46w_OkVq6L_bGTaWg2IlDodfsHbJQan-suR-Z3w-N_iQf3Bb3TzwiHmzOJA9ZU94CDrXNZ_z-dg0I" style="width: 224.00px; height: 66.67px; margin-left: 0.00px; margin-top: 0.00px; transform: rotate(0.00rad) translateZ(0px); -webkit-transform: rotate(0.00rad) translateZ(0px);" title="left right double arrow negative 3 open parentheses a squared plus 4 a b close parentheses equals 4 over 3 open parentheses 3 a squared minus 10 a b close parentheses left right double arrow 4 open parentheses 3 a squared minus 10 a b close parentheses plus 9 open parentheses a squared plus 4 a b close parentheses equals 0"> .