2x+y=22X+2+Y=4(x+1)+(x+1)+y=42/(x+1)+1/y=1/(x+1)+1/(x+1)+1/y由苛西不等式得到:[1/(x+1)+1/(x+1)+1/y]*[(x+1)+(x+1)+y]>=[(x+1)*1/(x+1)+(x+1)*1/(x+1)+y*1/y]^2=(1+1+1)^2=9即:4*[(x+1)+(x+1)+y]>=9所以:(x+1)+(x+1)+y>=9/4即最小值为9/4。