\(=\dfrac{20}{22}-\dfrac{3}{22}=\dfrac{17}{22}\)
\(\dfrac{10}{11}-\dfrac{3}{22}=\dfrac{20}{22}-\dfrac{3}{22}=\dfrac{17}{22}\)
\(\dfrac{5}{6}:4=\)
\(\dfrac{10}{11}-\dfrac{3}{22}\)
\(\dfrac{16}{21}\) + \(\dfrac{6}{7}\) ; \(\dfrac{15}{22}\) x \(\dfrac{11}{35}\) ; \(\dfrac{8}{11}\) : \(\dfrac{5}{22}\) ; \(\dfrac{9}{13}\) : \(\dfrac{27}{39}\) .
y x \(\dfrac{11}{12}\) + y x \(\dfrac{3}{4}\) = \(\dfrac{10}{11}\)
\(\dfrac{2}{5}\) + \(\dfrac{5}{6}\)
\(\dfrac{11}{10}\) - \(\dfrac{2}{5}\) : \(\dfrac{2}{3}\)
\(\dfrac{2}{3}\) - \(\dfrac{3}{8}\)
\(\dfrac{3}{4}\text{×}\dfrac{10}{9}-\dfrac{5}{11}\)=
=
|
Bài 2: Đúng ghi Đ, sai ghi S.
a) \(\dfrac{13}{39};\dfrac{3}{5};\dfrac{22}{33}\) đều là phân số tối giản.
b) Phân số \(\dfrac{5}{10}\) có thể viết thành phép chia 10 : 5
Bài1 tính:
a)\(\dfrac{2}{5}\)+\(\dfrac{5}{12}\); b)\(\dfrac{2}{3}\) - \(\dfrac{3}{8}\); c)\(\dfrac{3}{7}\) ✖ \(\dfrac{4}{9}\); d) \(\dfrac{11}{10}\) - \(\dfrac{2}{5}\) ː \(\dfrac{2}{3}\)
Chứng minh : \(\dfrac{9}{22}\) < \(\dfrac{1}{4}\) + \(\dfrac{1}{9}\)+ \(\dfrac{1}{16}\)+...\(\dfrac{1}{100}\)<\(\dfrac{9}{10}\)
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. \(\dfrac{22}{15}\)
