计算： 93/4+993/4+9993/4+99993/4+1

93/4+993/4+9993/4+99993/4+1
=1+1/4(100-7+1000-7+10000-7+100000-7)
=1+1/4(111100-7*4)
=1+1111*100/4-7
=1111*25-6
=27775-6
=27769