1 целая 7/60-0.01-1/40; 5/12-(3.1-2 целая 8/9); 6.8-( 2целых 1/15-1 целая 4/35); 5целых...

Решите задачу:

$1) 1\frac{7}{60}- \frac{1}{40}-0.01=1 \frac{14-3}{120}-0.01 =1 \frac{11}{120}- \frac{1}{100}=1 \frac{55-6}{600} =1 \frac{49}{600}$
$2) \frac{5}{12} +2 \frac{8}{9} -3.1=2 \frac{30+64}{72}-3.1=3 \frac{22}{72} -3 \frac{1}{10}= \frac{37}{180}$
$3)6.8- \frac{7-12}{105}=6.8+ \frac{5}{105}=6 \frac{8}{10}+ \frac{1}{21}=6 \frac{168+10}{210}=6 \frac{178}{210} =6 \frac{89}{105}$
$4)5 \frac{4}{21}-2 \frac{3}{14}-1.6=3 \frac{8-9}{42}-1.6=2 \frac{50-9}{42}-1 \frac{6}{10}=1 \frac{41}{42}-1 \frac{3}{5}= \frac{205-126}{210}$
$\frac{79}{210}$