(x ^ 3 * y ^ 3 + 4y ^ 2 * x ^ 2)/(y - 4)
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Step-by-step explanation:
Correct option is B)
Put x=3y=4
(3x+4y):(5x+6y)=(3×3+4×4):(5×3+6×4)
=(9+16):(15+24)
=25:39
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