(5supra7+55supra 77+555supra 777):5supra 7-111supra 500:(1supra 5+1supra 50+1supra500)=
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(5/7+55/77+555/777):5/7-111/500:(1/5+1/50+1/500)=
5/7(1+11/11+111/111)x7/5-111/500:1/5(1+1/10+1/100)=
5/7x7/5x[(1221+11x111+111)/1221-111/500:1/5[(100+10+1)/100]=
2553/1221-111/500:1/5x111/100=
2553/1221-111/500:111/500=
2553/1221-111/500x500/111=
2553/1221-1=(2553-1221)/1221=1332/1221=1,(09)
5/7(1+11/11+111/111)x7/5-111/500:1/5(1+1/10+1/100)=
5/7x7/5x[(1221+11x111+111)/1221-111/500:1/5[(100+10+1)/100]=
2553/1221-111/500:1/5x111/100=
2553/1221-111/500:111/500=
2553/1221-111/500x500/111=
2553/1221-1=(2553-1221)/1221=1332/1221=1,(09)
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