[分析] 不等式證明 |a+b-c|+|a-b+c|+|-a+b+c|>=|
1.
|a+b-c|+|a-b+c|+|-a+b+c| >= |a|+|b|+|c|
我猜可以從三角不等式著手,但是不知該如何下手...
2.
((a+b+c+d)/4)^4 >= abcd
3.
|2x-1| >= |x-1|+1
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