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a) 7/6 + 4/16 = 7/6 + 1/4 = 14/12 + 3/12 = 17/12
b) 2/12 + 15/6 = 1/6 + 15/6 = 16/6 = 8/3
c) 5/7 - 2/6 = 5/7 - 1/3 = 15/21 - 7/21 = 8/21
Chúc bạn học tốt.
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4/16=1/4
7/6+1/4=6/24+28/24=34/34=12/17
2/12=1/6
1/6+15/6=6/36+90/36=96/36=24/9
2/6=1/3
5/7-1/3=15/21-7/21=8/21
\(\frac{5}{7}-\frac{4}{17}=\frac{5}{7}-\frac{2}{8,5}=\frac{42,5}{59,5}-\frac{14}{59,5}=\frac{38,5}{59,5}\)
\(\frac{21}{27}-\frac{2}{9}=\frac{7}{9}-\frac{2}{9}=\frac{5}{9}\)
\(\frac{13}{5}-\frac{35}{25}=\frac{13}{5}-\frac{7}{5}=\frac{6}{5}\)
1.
a) \(\frac{16}{24}-\frac{1}{3}=\frac{16}{24}-\frac{8}{24}=\)\(\frac{8}{24}=\frac{1}{3}\)
b) \(\frac{4}{5}-\frac{12}{60}=\frac{48}{60}-\frac{12}{60}=\frac{36}{60}=\frac{9}{15}\)
3.
a)\(\frac{17}{6}-\frac{2}{6}=\frac{17-2}{6}=\frac{15}{6}\)
b) \(\frac{16}{15}-\frac{11}{15}=\frac{16-11}{15}=\frac{5}{15}=\frac{1}{3}\)
c) \(\frac{19}{12}-\frac{13}{12}=\frac{19-13}{12}=\frac{6}{12}=\frac{1}{2}\)
\(\frac{35}{40}=\frac{35\div5}{40\div5}=\frac{7}{8}\)
/HT\
a) \(\frac{1}{5}:\frac{2}{15}=\frac{1}{5}\times\frac{15}{2}\)
\(=\frac{15}{10}=\frac{3}{2}\)
b)\(\frac{3}{7}:\frac{9}{14}=\frac{3}{7}\times\frac{14}{9}\)
\(=\frac{42}{63}=\frac{2}{3}\)
c) \(\frac{7}{12}:\frac{21}{24}=\frac{7}{12}\times\frac{24}{21}\)
\(=\frac{168}{252}=\frac{2}{3}\)
d) \(\frac{9}{13}:\frac{27}{26}=\frac{9}{13}\times\frac{26}{27}\)
\(=\frac{234}{351}=\frac{2}{3}\)
k nha
A/ 15/10 = 3/2
B/ 42/63 = 2/3
C/ 168/252 = 2/3
D/ 234/351 = 2/3
\(\frac{2}{3}+\frac{3}{9}+\frac{7}{5}\)
\(=\frac{2}{3}+\frac{1}{3}+\frac{7}{5}\)
\(=\frac{10}{15}+\frac{5}{15}+\frac{21}{15}\)
\(=\frac{36}{15}\)
\(=\frac{12}{5}\)
\(\frac{2}{3}+\frac{3}{9}+\frac{7}{5}\)
=\(\frac{2}{3}+\frac{1}{3}+\frac{7}{5}\)
=\(\frac{7}{5}+\frac{2}{3}+\frac{1}{3}\)
=\(\frac{3}{3}+\frac{7}{5}\)
\(=1+\frac{7}{5}\)
=\(\frac{12}{5}\)
\(\dfrac{5}{7}\)>\(\dfrac{6}{21}\)
\(\dfrac{18}{24}\)>\(\dfrac{15}{25}\)
\(\dfrac{12}{13}\)=\(\dfrac{1212}{1313}\)
7 13 x 13 7 = 7 x 13 13 x 7 = 1