(-√2/2)^(-2/3)=(√2)^(2/3),
(-10/7)^(2/3)=(10/7)^(2/3)
1.1^(-4/3)=(1.21)^(-2/3)=(100/121)^(2/3)
指数2/3大于0,所以幂函数y=x^(2/3)是增函数
10/7 > √2 >100/121
(-10/7)^(2/3) >(-√2/2)^(-2/3)>1.1^(-4/3)