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15. Simplify the following expressions and evaluate it when x = 1, y = -1
(5xy - 3x^2 + 2y^2)× (5y^2 – 8xy + 3x^2) + 9x^3y - 8y^4 + 12x^4
{15 points}
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(-5-3+2)*(5+8+3)-27-8+12
(-6*16)-35+12
-96-35+12
-131+12
-119
(Not sure)
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