计算:y-x分之x+y+x-y分之y-y-x分之2x-y_数学解答

计算:y-x分之x+y+x-y分之y-y-x分之2x-y

人气：499 ℃　时间：2020-06-02 20:02:06

解答

(x+y)/(y-x) +y/(x-y) -(2x-y)/(y-x)
=(x+y)/(y-x)- y/(y-x) -(2x-y)/(y-x)
=[(x+y)-y -(2x-y)]/(y-x)
=(y-x)/(y-x)
=1