数学2次函数难啊!1.求下列格式中y的取值范围2.(1)Y=X²-2X-1,(0<X≤4)3.(2)Y=-2X²+6X+1,(X≤-1或X>2)4.(3)Y=(X²+2X+3)(X²+2X-1)-2X²-4X+55.(4)Y=-12 X²-2X-1,(M<X<1)6
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