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\(\frac{2}{4}+\frac{1}{4}=\frac{3}{4}\)\(\\ \frac{1}{3}+\frac{2}{3}=1\)\(\frac{9}{10}+\frac{1}{10}=1\)
=1/2-1/4+1/4-1/6+1/6-1/8+...+1/2014-1/2016
=1/2-1/2016
=1007/2016
TK va ket ban nhe
a) \(\frac{12}{25}+\frac{3}{5}+\frac{13}{25}\)
= \(\left(\frac{12}{25}+\frac{13}{25}\right)+\frac{3}{5}\)
= \(\frac{25}{25}+\frac{3}{5}\)
= \(1+\frac{3}{5}\)
= \(\frac{1}{1}+\frac{3}{5}\)
= \(\frac{5}{5}+\frac{3}{5}\)
= \(\frac{8}{5}\)
bài này tớ mà làm sai thì tớ ......................ko lm người........-_-
a) \(\frac{12}{25}+\frac{3}{5}+\frac{13}{25}\)
= \(\frac{12}{25}+\frac{15}{25}+\frac{13}{25}\)
= \(\frac{12+15+13}{25}\)
= \(\frac{40}{25}\)
= \(\frac{8}{5}\)
b) \(\frac{3}{2}+\frac{2}{3}+\frac{4}{3}\)
= \(\frac{9}{6}+\frac{4}{6}+\frac{8}{6}\)
= \(\frac{9+4+8}{6}\)
= \(\frac{21}{6}\)
= \(\frac{7}{2}\)
4 + \(\frac{3}{13}=\frac{4}{1}\)+ \(\frac{3}{13}=\frac{55}{13}\)
\(4+\frac{3}{13}=\frac{4}{1}+\frac{3}{13}=\frac{52}{13}+\frac{3}{13}=\frac{55}{13}\)
HT
\(\frac{3x}{2}-\frac{1}{3}=\frac{2}{5}+x\)
\(\Leftrightarrow\frac{3}{2}x-x=\frac{2}{5}+\frac{1}{3}\)
\(\Leftrightarrow\frac{1}{2}x=\frac{11}{15}\)
\(x=\frac{11}{15}:\frac{1}{2}=\frac{22}{15}\)
\(\frac{1}{2}\cdot\frac{2}{3}=\frac{2}{6}=\frac{1}{3}\)
= 1/3 do ban