=x/（x-5）-(x+1)/（5+x）+50/(25-x^)
=[x（5+x）-(x-1)（x-5）]/(x+5)(x-5)+50/(5-x)(5+x)
=-(5x+xx-xx+6x-5)/(5-x)(5+x)+50/(5-x)(5+x)
=(-5+11x+50)/(5-x)(5+x)
=(11x+45)/(5-x)(5+x)
=(33+45)/16
=4.875
你最好把分式的分之和分母都用括号合起来,不然看不明白