值域[0,+无穷）
偶函数
(-无穷,0]递减 [0,+无穷）递增定义域不用说值域：由于是什么的平方，所以是R+f(-x)=(-x)^2/5=x^(2/5)=f(x) 偶 (有个平方啊）单调性 若自变量大于等于0 x1^(2/5)-x2(2/5 )=(x1^0.2-x2^0.2)(x1^0.2+x2^0.2)这里设x2>x1(x1^0.2-x2^0.2)(x1^0.2+x2^0.2)小于0f(x1)
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