Violympic toán 6
Các câu hỏi tương tự
2. thực hiện phép tính
a. \(\dfrac{2}{5}-\dfrac{3}{7}+\dfrac{9}{45}\)
b\(\dfrac{5}{15}+\dfrac{14}{25}-\dfrac{12}{9}+\dfrac{2}{7}+\dfrac{11}{25}\)
c.\(\dfrac{21}{47}+\dfrac{9}{45}+\dfrac{26}{47}+\dfrac{45}{5}\)
Tìm x biết \(\dfrac{x}{6}+\dfrac{x}{10}+\dfrac{x}{15}+\dfrac{x}{21}+\dfrac{x}{28}+\dfrac{x}{36}+\dfrac{x}{45}+\dfrac{x}{55}+\dfrac{x}{66}+\dfrac{x}{78}=\dfrac{220}{39}\)
1. thực hiện phép tính
a. dfrac{11}{21}+dfrac{-4}{7}
b. dfrac{5}{15}+dfrac{14}{25}-dfrac{12}{9}+dfrac{2}{7}+dfrac{11}{25}
c. dfrac{2}{3}+dfrac{5}{7}-dfrac{3}{14}
d. dfrac{2}{5}-dfrac{3}{7}+dfrac{9}{45}
e.dfrac{21}{47}+dfrac{9}{45}+dfrac{26}{47}+dfrac{45}{5}
f. dfrac{15}{12}-dfrac{18}{13}+dfrac{5}{13}-dfrac{3}{12}
g. dfrac{-8}{18}-dfrac{15}{27}
h.dfrac{3}{7}+dfrac{-5}{2}-dfrac{3}{5}
i.(dfrac{11}{12}:dfrac{33}{16}).dfrac{3}{5}
Đọc tiếp
1. thực hiện phép tính
a. \(\dfrac{11}{21}\)+\(\dfrac{-4}{7}\)
b. \(\dfrac{5}{15}\)+\(\dfrac{14}{25}\)-\(\dfrac{12}{9}\)+\(\dfrac{2}{7}\)+\(\dfrac{11}{25}\)
c. \(\dfrac{2}{3}\)+\(\dfrac{5}{7}\)-\(\dfrac{3}{14}\)
d. \(\dfrac{2}{5}\)-\(\dfrac{3}{7}\)+\(\dfrac{9}{45}\)
e.\(\dfrac{21}{47}\)+\(\dfrac{9}{45}\)+\(\dfrac{26}{47}\)+\(\dfrac{45}{5}\)
f. \(\dfrac{15}{12}\)-\(\dfrac{18}{13}\)+\(\dfrac{5}{13}\)-\(\dfrac{3}{12}\)
g. \(\dfrac{-8}{18}\)-\(\dfrac{15}{27}\)
h.\(\dfrac{3}{7}\)+\(\dfrac{-5}{2}\)-\(\dfrac{3}{5}\)
i.(\(\dfrac{11}{12}\):\(\dfrac{33}{16}\)).\(\dfrac{3}{5}\)
1. rút gọn phân số
a. dfrac{7}{35}, dfrac{18}{54},dfrac{-15}{125},dfrac{-4}{25}
b. dfrac{27}{45},dfrac{21}{28},dfrac{8}{14}, dfrac{18}{-60}, dfrac{-270}{360}
c. dfrac{3.4+3.7}{6.5+9}
d. dfrac{-63}{81},dfrac{9.6}{9.35}, dfrac{7.2+8}{2.14.5}
Đọc tiếp
1. rút gọn phân số
a. \(\dfrac{7}{35}\), \(\dfrac{18}{54}\),\(\dfrac{-15}{125}\),\(\dfrac{-4}{25}\)
b. \(\dfrac{27}{45}\),\(\dfrac{21}{28}\),\(\dfrac{8}{14}\), \(\dfrac{18}{-60}\), \(\dfrac{-270}{360}\)
c. \(\dfrac{3.4+3.7}{6.5+9}\)
d. \(\dfrac{-63}{81}\),\(\dfrac{9.6}{9.35}\), \(\dfrac{7.2+8}{2.14.5}\)
Chứng tỏ rằng:
\(\dfrac{1}{5}+\dfrac{1}{13}+\dfrac{1}{14}+\dfrac{1}{15}+\dfrac{1}{61}+\dfrac{1}{62}+\dfrac{1}{63}< \dfrac{1}{2}\)
DX
25 tháng 2 2021 lúc 20:08
Tìm x :
\(\dfrac{1}{4}\) . \(\dfrac{2}{6}\) . \(\dfrac{3}{8}\) . \(\dfrac{4}{10}\) . .... . \(\dfrac{30}{62}\) . \(\dfrac{31}{64}\)
Tính hợp lý :
a,\(\left(\dfrac{136}{15}-\dfrac{28}{5}+\dfrac{62}{10}\right).\dfrac{21}{24}\)
b,\(\dfrac{3}{11}.\dfrac{4}{11}+\left(\dfrac{3}{13}.\dfrac{4}{11}-\dfrac{1}{13}\right)\)
-45% . x + 2\(\dfrac{3}{8}\) = -1\(\dfrac{31}{40}\)
a)Tìm số nguyên sao cho 4n-5 chia hết cho n-3
b)Chứng minh rằng:
S=\(\dfrac{1}{5}+\dfrac{1}{13}+\dfrac{1}{14}+\dfrac{1}{15}+\dfrac{1}{61}+\dfrac{1}{62}+\dfrac{1}{63}< \dfrac{1}{2}\)