\(\dfrac{20}{50}\times\dfrac{152}{120}=\dfrac{3040}{6000}=\dfrac{38}{75}\)
=\(\dfrac{20x152}{50x120}=\dfrac{5x2x2x8x19}{5x2x5x8x15}=\dfrac{2x19}{5x15}=\dfrac{38}{75}\)
\(\dfrac{20}{50}\times\dfrac{152}{120}=\dfrac{3040}{6000}=\dfrac{38}{75}\)
=\(\dfrac{20x152}{50x120}=\dfrac{5x2x2x8x19}{5x2x5x8x15}=\dfrac{2x19}{5x15}=\dfrac{38}{75}\)
\(\dfrac{5}{2}\) bằng :
a. \(\dfrac{25}{10}\) b. \(\dfrac{50}{20}\) c. \(\dfrac{15}{6}\) d. \(\dfrac{20}{8}\)
chọn cái nào h :)?
\(\dfrac{120}{20}\)
a.\(\dfrac{2}{3}\times\dfrac{1}{4}-\dfrac{1}{3}\times\dfrac{1}{2}\) =
b.\(\dfrac{8}{5}\times\dfrac{1}{4}-\dfrac{2}{5}\times\dfrac{1}{2}-\dfrac{1}{2}\times\dfrac{1}{5}=\)
giải rõ ràng cho mình nhé
\(\dfrac{2}{3}\times\dfrac{4}{5}+\dfrac{1}{3}\times\dfrac{4}{5}\)
Tính:
a) \(\dfrac{9}{5}+\dfrac{2}{5}\times\dfrac{4}{6}\)
b) \(\dfrac{3}{8}\times2-\dfrac{6}{7}\times\dfrac{1}{3}\)
\(\dfrac{2}{3}\times\dfrac{3}{4}\times\dfrac{4}{5}\div\dfrac{1}{5}\)
Tính:
a) \(\dfrac{6}{7}\times\dfrac{2}{3}=...\)
b) \(\dfrac{3}{8}\times\dfrac{3}{8}=...\)
Quy đồng mẫu số của và .
Bài giải
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Tính bằng cách thuận tiện nhất
\(\dfrac{2}{3}\times\dfrac{3}{4}\times\dfrac{4}{5}\)
\(F=\dfrac{1}{2\times\left(1+2\right)}+\dfrac{1}{2\times\left(1+2+3\right)}+....+\dfrac{1}{2\times\left(1+2+3+...+9\right)}\)