Приведите к новому знаменателю:1) 7 1/2; 9 2/5; 3 4/5 к знаменателю 10;2) 6 3/4; 5 9/20;...

1) 7 1/2; 9 2/5; 3 4/5 к знаменателю 10;
$7 \frac{1}{2}=7 \frac{1*5}{2*5}=7 \frac{5}{10} \\ \\ 9 \frac{2}{5}=9 \frac{2*2}{5*2}= 9\frac{4}{10} \\ \\ 3 \frac{4}{5}=3 \frac{4*2}{5*2} =3 \frac{8}{10}$

2) 6 3/4; 5 9/20; 8 6/25; 1 3/50 к знаменателю 100;
$6 \frac{3}{4}=6 \frac{3*25}{4*25}=6 \frac{75}{100} \\ \\ 5 \frac{9}{20}=5 \frac{9*5}{20*5}=5 \frac{45}{100} \\ \\ 8 \frac{6}{25}=8 \frac{6*4}{25*4}=8 \frac{24}{100} \\ \\ 1 \frac{3}{50}=1 \frac{3*2}{50*2}=1 \frac{6}{100}$

3) 2 5/8; 3 7/125, 6 11/125,4 123/500 к знаменателю 1000
$2 \frac{5}{8}=2 \frac{5*125}{8*125}= 2 \frac{625}{1000} \\ \\ 3 \frac{7}{125}=3 \frac{7*8}{8*125}=3 \frac{56}{1000} \\ \\ 6 \frac{11}{125}=6 \frac{11*8}{8*125}=6 \frac{88}{1000} \\ \\ 4 \frac{123}{500} =4 \frac{123*2}{500*2}=4 \frac{246}{1000}$