Question

1,先化解后求值 (a2/a+1-1/a+1)×a/a2-2a+1 其中a=1/2...

Answer 1

1：(a2/a+1-1/a+1)×a/a2-2a+1原式= [a^2/(a+1)-1/(a+1)]×[a/(a^2-2a+1)]=(a+1)(a-1)/(a+1)×a/(a-1)^2=a×(a-1)代入a=1/2,原式=-1 2：原式=5×400+[3^2-(@3)^2]-1+1=2000+9-3+0=2006