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7 - 1 $\frac{4}{5}$ × ( 1 $\frac{1}{4}$ + $\frac{1}{12}$ ) : 3 = 6 $\frac{49}{64}$
1) 1 $\frac{1}{4}$ + $\frac{1}{12}$ = $\frac{5}{4}$ + $\frac{1}{12}$ = $\frac{15}{12}$ + $\frac{1}{12}$ = $\frac{16}{12}$
2) 1 $\frac{4}{5}$ × $\frac{16}{12}$ = $\frac{9}{5}$ × $\frac{16}{12}$ = $\frac{15}{64}$
3) $\frac{15}{64}$ : 3 = $\frac{15}{64}$ × $\frac{1}{3}$ = $\frac{5}{64}$
4) 7 - $\frac{5}{64}$ = $\frac{448}{64}$ - $\frac{5}{64}$ = $\frac{443}{64}$ = 6 $\frac{49}{64}$