49/5+499/5+4999/5+3/5
=49/5+499/5+4999/5+1/5+1/5+1/5
=(49+1)/5+(499+1)/5+(4999+1)/5
=50/5+500/5+5000/5
=10+100+1000
=1110
有不懂欢迎追问
49/5+499/5+4999/5+3/5 简算、
49/5+499/5+4999/5+3/5
=49/5+499/5+4999/5+1/5+1/5+1/5
=(49+1)/5+(499+1)/5+(4999+1)/5
=50/5+500/5+5000/5
=10+100+1000
=1110
有不懂欢迎追问