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设f(x)=|x+1|﹣|x﹣4|. (1)若f(x)≤﹣m2+6m恒成立,求实数m的取值范围; (2)设(1)中m最大值为m0,a,b,c均为正实数,当3a+4b+5c=m0时,求证:.
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高二下学期数学《2017-2018学年黑龙江省哈师大附中高二(下)期中数学试卷(理科)》真题及答案
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