2025-10-07
1、家庭教师的大姐姐x+1分之x-1 - x-1分之x =0x+1分之x-1 =x-1分之x 且x不等于正负1(x-1 )*(x-1)=x*(x+1)x*x-2x+1=x*x+xx=1/3...