f(0)=1-0=1>0
f(1/3)=(1/3)^(1/3)-(1/3)^(1/2)指数函数g(x)=(1/3)^x的性质得f(1/3)>0
f(1/2)=(1/3)^(1/2)-(1/2)^(1/2)函数g(x)=√x的性质得g(1/3)<g(1/2)
即f(1/2)<0
f(1)=-2/3<0
f(2)=1/9-√2<0
选择题嘛,这样好做呀,而且用别的话做起来不轻松
f(0)=1-0=1>0
f(1/3)=(1/3)^(1/3)-(1/3)^(1/2)指数函数g(x)=(1/3)^x的性质得f(1/3)>0
f(1/2)=(1/3)^(1/2)-(1/2)^(1/2)函数g(x)=√x的性质得g(1/3)<g(1/2)
即f(1/2)<0
f(1)=-2/3<0
f(2)=1/9-√2<0
选择题嘛,这样好做呀,而且用别的话做起来不轻松