第8章 8.29

(1)

x<x+2x < \sqrt{x+2}

(2)

x<6x\sqrt{x} < 6-x

(3)

5x>x3\sqrt{5-x} > x-3

(4)

2x+1<1x\sqrt{2x+1} < 1-x

解説: r31bn1z