4(целых)5/14+(5 1/12- 3 4/21)=6,25
1) 5 1/12-3 4/21=61/12-67/21= (7*61-4*67)/84=(427-268)/84=159/84
2)4 5/14+159/84=61/14+159/84=(6*61+159)/84=(366+159)/84=525/84=6,25
4(целых)5/14+(5 1/12- 3 4/21)=6,25
1) 5 1/12-3 4/21=61/12-67/21= (7*61-4*67)/84=(427-268)/84=159/84
2)4 5/14+159/84=61/14+159/84=(6*61+159)/84=(366+159)/84=525/84=6,25