满足不等式3|n-1|-2n>2|3n+1|的整数n的个数是?
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满足不等式3|n-1|-2n>2|3n+1|的整数n的个数是?
满足不等式3|n-1|-2n>2|3n+1|的整数n的个数是?
满足不等式3|n-1|-2n>2|3n+1|的整数n的个数是?
n-1=0 n=1
3n+1=0 n=-1/3
当n-1>=0时
n>=1
3(n-1)-2n>2(3n+1)
5n
当n>=1
3n-3-2n>6n+2
-5>5n 无解
当n=0 0>2 不成立
当n<=-1
3-3n-2n>-6n-6
n>-9
-1,-2.....-8 共8个解
证明不等式:(1/n)^n+(2/n)^n+(3/n)^n+.+(n/n)^n
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