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二次函数：将抛物线y=-x²-2x+c向下平移m个单位，求m取值范围？
用不等式求二次函数m的取值范围。
二次函数培优题139/147
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用不等式求二次函数m的取值范围。
App03:50App07:05App02:58App06:20App03:38App02:42App08:36App10:38App07:35App02:41
