y(y-2)²-y(y+3)(y-5) y=1/2 化简求值

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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
y(y-2)²-y(y+3)(y-5)
=y(y²-4y+4-(y²-2y-15))
=y(-2y+19)
=(1/2)*(-2*1/2+19)
=(1/2)*(18)
=9