Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
\(a,\frac{15}{18}=\frac{5}{6}\)
\(b,\frac{144}{351}=\frac{16}{39}\)
\(c,\frac{6}{30}=\frac{1}{5}\)
\(d,\frac{2005}{3000}=\frac{401}{600}\)
a )
2 / 3 + 5 / 4 = 8 / 12 + 15 / 12 = 23 / 12
b )
15 / 25 + 6 / 21 = 3 / 5 + 2 / 7
= 21 / 35 + 10 / 35
= 31 / 35
c )
4 / 3 - 11 / 15 = 20 / 15 - 11 / 15
= 9 / 15
d )
12 / 10 - 2 / 5 = 12 / 10 - 4 / 10
= 8 / 10
= 4 / 5
\(\frac{2010}{2011}< \frac{2011}{2012}\)
\(\frac{11}{12}=\frac{22}{24}\)
\(\frac{25}{30}>\frac{25}{49}\)
\(\frac{1}{5}< \frac{3}{8}\)
\(\frac{1995}{1997}< \frac{1995}{1996}\)
a) \(\frac{2}{5}+\frac{9}{15}=\frac{2}{5}+\frac{3}{5}=\frac{5}{5}=1\)
b) \(\frac{15}{45}+\frac{25}{30}=\frac{1}{3}+\frac{5}{6}=\frac{2}{6}+\frac{5}{6}=\frac{7}{6}\)
c) \(\frac{28}{32}+\frac{45}{72}=\frac{7}{8}+\frac{5}{8}=\frac{12}{8}=\frac{3}{2}\)
d) \(\frac{8}{28}+\frac{5}{30}=\frac{2}{7}+\frac{1}{6}=\frac{12}{42}+\frac{7}{42}=\frac{19}{42}\)
a) \(\frac{2}{5}+\frac{9}{15}\)=\(\frac{2}{5}+\frac{3}{5}=\frac{2+3}{5}=1\)
b)\(\frac{15}{45}+\frac{25}{30}=\frac{1}{3}+\frac{5}{6}=\frac{2}{6}+\frac{5}{6}=\frac{2+5}{6}=\frac{7}{6}\)
c)\(\frac{28}{32}+\frac{45}{72}=\frac{7}{8}+\frac{5}{8}=\frac{7+5}{8}=\frac{12}{8}=\frac{3}{2}\)
d)\(\frac{8}{28}+\frac{5}{30}=\frac{2}{7}+\frac{1}{6}=\frac{12}{42}+\frac{7}{42}=\frac{12+7}{42}=\frac{19}{42}\)
a,\(\frac{26}{7}\)
b,\(\frac{78}{19}\)
c,\(\frac{13}{11}\)
d,\(1\)
a, \(4-\frac{2}{7}\)=\(\frac{26}{7}\)
b,5-\(\frac{17}{19}=\frac{78}{19}\)
c,\(\frac{35}{11}-2=\frac{13}{11}\)
d,\(\frac{68}{17}-3=1\)
k mình nha
\(a,\frac{4}{5}\times\frac{a}{b}=\frac{7}{10}\)
\(\frac{a}{b}=\frac{7}{10}:\frac{4}{5}\)
\(\frac{a}{b}=\frac{7}{10}\times\frac{5}{4}\)
\(\frac{a}{b}=\frac{7}{8}\)
\(b,\frac{1}{3}:\frac{a}{b}=\frac{2}{3}:\frac{4}{3}\)
\(\frac{1}{3}:\frac{a}{b}=\frac{2}{3}\times\frac{3}{4}\)
\(\frac{1}{3}:\frac{a}{b}=\frac{1}{2}\)
\(\frac{a}{b}=\frac{1}{3}:\frac{1}{2}\)
\(\frac{a}{b}=\frac{1}{3}\times2\)
\(\frac{a}{b}=2\)
\(c,\frac{a}{b}+\frac{3}{8}=\frac{5}{6}\)
\(\frac{a}{b}=\frac{5}{6}-\frac{3}{8}\)
\(\frac{a}{b}=\frac{11}{24}\)
\(a,\frac{3}{15}+\frac{2}{5}=\frac{1}{5}+\frac{2}{5}=\frac{3}{5}.\)
\(b,\frac{9}{8}-\frac{5}{6}=\frac{7}{24}\)
\(c,\frac{1}{2}+\frac{3}{7}+\frac{11}{14}=\frac{13}{14}+\frac{11}{14}=\frac{24}{14}=\frac{12}{7}\)
\(d,\frac{8}{3}-\frac{1}{2}-1=\frac{13}{6}-1=\frac{7}{6}\)
~~~ học tốt ~~~
\(\frac{a}{b}=\frac{c}{d}\Rightarrow\frac{a}{c}=\frac{b}{d}=\frac{a+b}{c+d}\Rightarrow\frac{a+b}{c}=\frac{c+d}{d}\)
Ta có: \(\frac{a}{b}=\frac{c}{d}\)
=>\(\frac{a}{b}+1=\frac{c}{d}+1\)
=>\(\frac{a}{b}+\frac{b}{b}=\frac{c}{d}+\frac{d}{d}\)
=>\(\frac{a+b}{b}=\frac{c+d}{d}\)
=>ĐPCM