∵a=1除以根号2-1=(√2+1)/(√2+1)(√2-1)=√2+1∴a方+2a+1除以a方-1减1除以a+1=（a+1)²/(a-1)(a+1)-(a-1)/（a+1)(a-1)=（a+1)²-(a-1)/（a+1)(a-1)=(2+1+2√2-√2）/(2+√2)=(3+√2)(2-√2)/(2+√2)(2-√2...