例一:y=x²+4x+3=(x+2)²-4+3=(x+2)²-1≥-1
即该二次函数有最小值-1(当x=-2时);
例二:y=-2x²+8x+5=-2(x²-4x)+5=-2[(x-2)²-4]+5
=-2(x-2)²+13≤13,即该二次函数有最大值13(当x=2时)
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