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Ta co ;\(\frac{17}{20}\)=\(\frac{2}{20}\)+\(\frac{5}{20}\)+\(\frac{10}{20}\)
\(\Rightarrow\)\(\frac{2}{20}\)=\(\frac{1}{10}\) ; \(\frac{5}{20}\)=\(\frac{1}{4}\) ; \(\frac{10}{20}\)= \(\frac{1}{2}\)
\(\dfrac{7}{12}=\dfrac{3}{12}+\dfrac{4}{12}=\dfrac{1}{4}+\dfrac{1}{3}\)
\(\dfrac{13}{27}=\dfrac{9}{27}+\dfrac{4}{27}=\dfrac{1}{3}+\dfrac{4}{27}\)
\(\dfrac{7}{12}\) = \(\dfrac{1+6}{12}\) = \(\dfrac{1}{12}\) + \(\dfrac{6}{12}\) = \(\dfrac{1}{12}\) + \(\dfrac{1}{2}\)
\(\dfrac{7}{12}\) = \(\dfrac{3+4}{12}\) = \(\dfrac{3}{12}\) + \(\dfrac{4}{12}\) = \(\dfrac{1}{4}\) + \(\dfrac{1}{3}\)
\(\dfrac{13}{27}\) = \(\dfrac{1+12}{27}\) = \(\dfrac{1}{27}\) + \(\dfrac{12}{27}\) = \(\dfrac{1}{27}\) + \(\dfrac{4}{9}\)
\(\dfrac{13}{27}\) = \(\dfrac{4+9}{27}\) = \(\dfrac{4}{27}\) + \(\dfrac{9}{27}\) = \(\dfrac{4}{27}\) + \(\dfrac{1}{3}\)
\(\dfrac{13}{27}\) = \(\dfrac{6+7}{27}\) = \(\dfrac{6}{27}\) + \(\dfrac{7}{27}\) = \(\dfrac{2}{9}\) + \(\dfrac{7}{27}\)
a: \(\frac{13}{27}=\frac{1}{27}+\frac{12}{27}=\frac{1}{27}+\frac49=\frac{1}{27}+\frac{3+1}{9}=\frac{1}{27}+\frac39+\frac19\)
\(=\frac{1}{27}+\frac19+\frac13\)
b: \(\frac{15}{16}=\frac{1}{16}+\frac{14}{16}\)
\(=\frac{1}{16}+\frac78=\frac{1}{16}+\frac{4+3}{8}=\frac{1}{16}+\frac48+\frac38\)
\(=\frac{1}{16}+\frac12+\frac{2+1}{8}=\frac{1}{16}+\frac12+\frac14+\frac18\)
c: \(\frac{39}{54}=\frac{38+1}{54}=\frac{38}{54}+\frac{1}{54}\)
\(=\frac{1}{54}+\frac{19}{27}=\frac{1}{54}+\frac{1}{27}+\frac{18}{27}\)
\(=\frac{1}{54}+\frac{1}{27}+\frac23=\frac{1}{54}+\frac{1}{27}+\frac46=\frac{1}{54}+\frac{1}{27}+\frac36+\frac16\)
\(=\frac{1}{54}+\frac{1}{27}+\frac16+\frac12\)
d: \(\frac{13}{42}=\frac{6+7}{42}=\frac{6}{42}+\frac{7}{42}=\frac17+\frac16\)
a)\(\frac{13}{35}\)\(=\)\(\frac{1}{7}+\frac{1}{5}+\frac{1}{35}\)
b)\(\frac{17}{63}=\frac{1}{7}+\frac{1}{9}+\frac{1}{63}\)
k cho mình nha
\(\frac{10}{27}=\frac{1}{27}+\frac{5}{27}+\frac{4}{27}\)
\(\frac{13}{12}=\frac{1}{12}+\frac{5}{12}+\frac{7}{12}\)
\(\frac{15}{8}=\frac{3}{8}+\frac{5}{8}+\frac{7}{8}\)
10/27=1/27+4/27+5/27
13/12=13/12-1/12+0/12
15/8=7/8+5/8+3/8
kik
ta có :
\(\frac{1}{3}=\frac{1}{4}+\frac{1}{12}\)
\(\frac{9}{12}=\frac{1}{2}+\frac{1}{5}+\frac{1}{20}\)
\(\frac{9}{15}=\frac{1}{2}+\frac{1}{11}+\frac{1}{110}\)
a,=1/4+1/7+1/14
b,=1/3+1/5+1/9
a) 13/28 = 7/28 + 4/28 + 2/28 = 1/4 + 1/7 + 1/14
b) 29/45 = 15/45 + 9/45 + 5/45 = 1/3 + 1/5 + 1/9
Hok tốt !
#Minh#
A=1\4+1\7+1\14
B=1\3+1\5+1\9
Cảm ơn các bạn rất nhiều.