Rút gọn rồi tính (giúp em câu này nhé)
15/25+6/21
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\(\frac{15}{25}+\frac{6}{21}=\frac{3}{5}+\frac{2}{7}=\frac{21}{35}+\frac{10}{35}=\frac{31}{35}\)
HT
a, \(\frac{5}{16}+\frac{3}{8}=\frac{5}{16}+\frac{6}{16}=\frac{11}{16}\)
b, \(\frac{15}{25}+\frac{6}{21}=\frac{3}{5}+\frac{2}{7}\)
\(=\frac{21}{35}+\frac{10}{35}=\frac{31}{35}\)
a: =1/4+1/4=2/4=1/2
b: =3/5+3/5=6/5
c: =5/9+7/9=12/9=4/3
a,\(\frac{4}{6}+\frac{18}{27}=\frac{2}{3}+\frac{2}{3}=\frac{4}{3}\)
b,\(\frac{15}{25}+\frac{6}{21}=\frac{3}{5}+\frac{2}{7}=\frac{21}{35}+\frac{10}{35}=\frac{31}{35}\)
a,4/6 = 2/3 ; 18/27 = 2/3
ta có: 2/3 + 2/3 = 4/3
b,15/25 = 3/5 ; 6/21 = 2/7
ta có: 3/5 + 2/7 = 6/2
a, 15/25 - 3/21 = 3/5 - 1/7 = 21/35 - 5/35 = 18/35
b, 24/36 - 6/12 = 2/3 - 1/2 = 4/6 - 3/6 = 1/6
\(\frac{9}{12}+\frac{4}{7}\)
\(=\frac{3}{4}+\frac{4}{7}\)
\(=\frac{37}{28}\)
\(\frac{5}{10}+\frac{21}{28}\)
\(=\frac{1}{2}+\frac{3}{4}\)
\(=\frac{5}{4}\)
\(\frac{7}{9}+\frac{15}{27}\)
\(=\frac{7}{9}+\frac{5}{9}\)
\(=\frac{12}{9}\)
\(\frac{55}{66}-\frac{14}{21}=\frac{5}{6}-\frac{2}{3}=\frac{5}{6}-\frac{4}{6}=\frac{1}{6}\)
\(\frac{15}{25}+\frac{10}{20}=\frac{3}{5}+\frac{1}{2}=\frac{6}{10}+\frac{5}{10}=\frac{11}{10}\)
a) 3/5 + 2/5 = 5/5 = 1
b) 4/6 =2/3 ; 18/27 = 2/3
2/3 + 2/3 = 4/3
c) mình ko biết làm
a) \(\frac{3}{5}+\frac{2}{5}=\frac{3+2}{5}=\frac{5}{5}=1\)
b)\(\frac{4}{6}=\frac{2}{3}\)
\(\frac{18}{27}=\frac{2}{3}\)
\(\frac{2}{3}+\frac{2}{3}=\frac{2+2}{3}=\frac{4}{3}\)
c)\(\frac{15}{25}=\frac{3}{5}\)
\(\frac{6}{21}=\frac{2}{7}\)
\(\frac{3}{5}+\frac{2}{7}=\frac{21}{35}+\frac{10}{35}=\frac{21+10}{35}=\frac{31}{35}\)
\(\dfrac{5}{7}\)>\(\dfrac{6}{21}\)
\(\dfrac{18}{24}\)>\(\dfrac{15}{25}\)
\(\dfrac{12}{13}\)=\(\dfrac{1212}{1313}\)
15/25 + 6/21 = 31/35
15/25 + 6/21 = 31/35