4又11/12+49又11/12+499又11/12+4999又11/12+1/3

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4又11/12+49又11/12+499又11/12+4999又11/12+1/3
4又11/12+49又11/12+499又11/12+4999又11/12+1/3

4又11/12+49又11/12+499又11/12+4999又11/12+1/3
4又11/12+49又11/12+499又11/12+4999又11/12+1/3
=4+11/12+49+11/12+499+11/12+4999+11/12+1/3
=(4+49+499+4999)+(4×11/12+1/3)
=(5-1+50-1+500-1+5000-1)+(11/3+1/3)
=(5+50+500+5000)-4+4
=5555