Question

麻烦那位高手帮我解一个很简单的数学题

Answer 1

x3-(x2-x+1)=x3-x2+x-1=(x2+1)(x-1),又x2+1>=1>0,x-1>=0,所以x3-(x2-x+1）》=0，所以x3>=x2-x+1