Сравните дроби с разными знаменателями В) 2/9+3/8 Е) 5/12+4/15 И) 7/37+5/51 М)9/180+7/120...

В)
$\frac{2}{9} +\frac{3}{8} = \frac{2*8}{9*8}+ \frac{3*9}{8*9}= \frac{16}{72}+ \frac{27}{72} = \frac{43}{72} \\ \\ \frac{2}{9} \ \textless \ \frac{3}{8} \\$

е)
$\frac{5}{12}+ \frac{4}{15}= \frac{5*5}{12*5} + \frac{4*4}{15*4} = \frac{25+16}{60} = \frac{41}{60} \\ \\ \frac{5}{12} \ \textgreater \ \frac{4}{15}$

и)
$\frac{7}{37} + \frac{5}{51} = \frac{7*51}{1187} + \frac{5*37}{1187} = \frac{357+185}{1187} = \frac{542}{1187} \\ \\ \frac{7}{37} \ \textgreater \ \frac{5}{51}$

м)
$\frac{9}{180} + \frac{7}{120} = \frac{1}{20} + \frac{7}{120} = \frac{6}{120} + \frac{7}{120} = \frac{13}{120} \\ \\ \frac{9}{180} \ \textless \ \frac{7}{120}$