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 Подробности /-Дробь. Created by Killer228123. matematika-ru

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ryazanova1952 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)
$\frac{9}{180} + \frac{7}{120} = \frac{1}{20} + \frac{7}{120} = \frac{6}{120} + \frac{7}{120} = \frac{13}{120} \\ \\ 
 \frac{9}{180} \ \textless \ \frac{7}{120}$

zhenyaM2002

Verified answer

2/9=16/72, 3/8=27/72. 2/9 < 3,8 ; 16/72+27/72=43/72
5/12=25/60, 4/15=16/60, 5/12 > 4/15; 25/60+16/60=41/60
7/37=357/1887, 5/51=185/1887 7/37 > 5/51; 357/1887+185/1887=542/1887
9/180=18/360, 7/120=21/360, 9/180 < 7/120; 18/360+21/360=39/360=13/120

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