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a,\(\frac{1}{5}\times\frac{2}{9}\div\frac{1}{15}\)
\(=\frac{1}{5}\times\frac{2}{9}\times15\)
\(=\left(\frac{1}{5}\times15\right)\times\frac{2}{9}\)
\(=3\times\frac{2}{9}\)
\(=\frac{2}{3}\)
b\(\frac{4}{15}\times\frac{7}{15}\times\frac{5}{4}\)
\(=\left(\frac{4}{15}\times\frac{5}{4}\right)\times\frac{7}{15}\)
\(=\frac{1}{3}\times\frac{7}{15}\)
\(=\frac{7}{45}\)
c,\(\frac{21}{23}\times\frac{5}{11}\times\frac{44}{?}\)
d,\(26\times\frac{13}{42}\div13\)
\(=\left(26\div13\right)\times\frac{13}{42}\)
\(=2\times\frac{13}{42}\)
\(=\frac{13}{21}\)
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\(6=\dfrac{12}{2}\)
\(9=\dfrac{18}{2}\)
\(4=\dfrac{8}{2}\)
\(12=\dfrac{24}{2}\)
\(11=\dfrac{22}{2}\)
\(10=\dfrac{20}{2}\)
\(13=\dfrac{26}{2}\)
\(23=\dfrac{46}{2}\)
\(30=\dfrac{60}{2}\)
Nhanh nhanh lên giúp mình
= 67 nha bạn ơi