4целых-(41/84-5/21)+7целых11/30

[latex]4-( \frac{41}{84} - \frac{5}{21} )+7 \frac{11}{30} =4-( \frac{41}{84} - \frac{20}{84} )+7 \frac{11}{30} =4- \frac{21}{84} +7 \frac{11}{30} = \\ 4- \frac{1}{4} +7 \frac{11}{30} = 3\frac{3}{4} +7 \frac{11}{30}=3\frac{45}{60} +7 \frac{22}{60}=10 \frac{67}{60} =11 \frac{7}{60} \\ [/latex]