某林场计划第1年造林2Km2以后每一年比上一年多造林5第5年2(1+3%)^42,limx021x1x2解:[2-1/x+1/x2]=(2x2-x+1)/x2lim(x→0)[2-(1/x)+(1/x2)]=lim(x→0)[(2x2-x+1)/x2]=+∞x→0,分子2x2-x+1→1,分母x2→0所以:极限是+∞。3,解方程x32x10x3-2x+1=0x3-x-x+1=0x(x2-1)-(x-1)=0x(x+1)(x-1)-(x-1)=0(x-1)[x(x+1)-1]=0(x-1)(x2+x-1