Trong phép tính sau, giá trị của x là :
\(\dfrac{5}{9}\) : x = \(\dfrac{8}{9}\) - \(\dfrac{1}{5}\)
a. \(\dfrac{11}{6}\)
b. \(\dfrac{44}{30}\)
c. \(\dfrac{25}{31}\)
d. \(\dfrac{22}{15}\)
Tính
a.\(\dfrac{4}{9}+\dfrac{3}{7}\) \(\dfrac{3}{4}+\dfrac{7}{24}\) \(\dfrac{1}{3}+\dfrac{2}{9}+\dfrac{4}{27}\)
b.\(\dfrac{5}{6}-\dfrac{3}{8}\) \(\dfrac{7}{15}-\dfrac{11}{30}\) \(\dfrac{2}{3}+\dfrac{1}{6}-\dfrac{7}{12}\)
c.\(\dfrac{18}{25}\times\dfrac{15}{6}\) \(\dfrac{30}{49}:\dfrac{6}{7}\) \(\dfrac{1}{2}\times\dfrac{3}{4}:\dfrac{6}{5}\)
d.\(8\times\dfrac{3}{5}:\dfrac{12}{5}\) \(4:\dfrac{9}{5}:\dfrac{10}{3}\)
3 bn đầu tiên xong mik sẽ tick
số 3 có thể viết thành:
a)\(\dfrac{30}{10}\) b,\(\dfrac{3}{10}\) c,\(\dfrac{30}{3}\) d,\(\dfrac{30}{30}\)
\(\dfrac{11}{9}\) - \(\dfrac{5}{6}\) : 15
\(\dfrac{3}{16\:}\)+ \(\dfrac{ }{ }\)\(\dfrac{7}{30}\) x \(\dfrac{15}{28}\)
phân số bé hơn \(\dfrac{17}{45}\) là:
A. \(\dfrac{8}{18}\) B. \(\dfrac{12}{30}\) C. \(\dfrac{4}{12}\) D. \(\dfrac{38}{90}\)
Tính nhanh:\((\) \(\dfrac{1}{3}\)-\(\dfrac{1}{5}\)-\(\dfrac{1}{10}\)-\(\dfrac{1}{30}\))x(\(\dfrac{1}{21}\)+\(\dfrac{1}{210}\)+\(\dfrac{1}{2010}\))
\(\dfrac{30-x}{30}=\dfrac{5}{15};\dfrac{x+30}{72}=\dfrac{5}{8}\)
Tìm X: \(\dfrac{30-x}{30}=\dfrac{8}{15};\dfrac{x+30}{72}=\dfrac{5}{8}\)
Hãy so sánh các phân số sau bằng phương pháp so sánh phần bù :
a)\(\dfrac{10}{11}và\dfrac{19}{20}\)
b) \(\dfrac{13}{15}và\dfrac{15}{17}\)
c) \(\dfrac{31}{35}và\dfrac{35}{37}\)