1,先化简再求值:(y-2)(y^2 -6y-9)-y(y^2 -2y-15),其中y=1/22,计算:(x+y-z)^3n * (z-x-y)^2n * (x-z+y)^5n (n为正整数)3,已知2^2n+1 + 4^n=192,求n的值.4,已知(x^2 +mx+n)(x^2 -3x+2)中不含x^2项和x项,求m和n的值.5,若x(x+1)<(x+3
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(y-2)(y^2-6y-9)-y(y^2-2y-15),其中y=1/2.先化简再求值.
y(y-2)²-y(y+3)(y-5) y=1/2 化简求值
y(y-2)²-y(y+3)(y-5) y=1/2 化简求值
y(y-2)²-y(y+3)(y-5) y=1/2 化简求值
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