Question

1.已知x=2分之1,求(x+2)的平方分之1+x除以（x-2+x+2分之3）的值.2.先化简(

Answer 1

1原式=1/(5/2)^2+1/2/(1-2+2/3)=4/25+1=29/25

2原式=(1+a-2/3)/a^2-a/4+1=(a+1/3)/a^2-a/4+1

带入a=1得原式=(4/3)-1/4+1=7/12

3 x^2-x^2/2=1-√3-√2/2 x^2