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1. |
Q: If 12x – 15 y =9x + 5y, the value of $$ {x^{2}+{y^{2}}\over{x^{2}-y^{2}}}$$ is |
A. | $$ {23\over 17}$$ |
B. | $$ {391\over 409}$$ |
C. | $$ {400\over 9}$$ |
D. | $$ {409\over 391}$$ |
Answer» E. | |