Violympic toán 6
Các câu hỏi tương tự
tính nhanh
B=\(\left(\dfrac{1}{3}-1\right)+\left(\dfrac{1}{6}-1\right)+\left(\dfrac{1}{10}-1\right)+...+\left(\dfrac{1}{45}-1\right)\)
1,tính:
\(\dfrac{\dfrac{6}{67}\left(17^{21}_{56}-13^{21}_{45}\right):\left(\dfrac{3}{5.22}+\dfrac{54}{44.65}+\dfrac{18}{65.72}\right)}{29^3:100-\left(29^3:0,47\right)}\)
Tính nhanh
B=\(\left(\dfrac{1}{3}-1\right)+\left(\dfrac{1}{6}-1\right)+\left(\dfrac{1}{9}-1\right)+...+\left(\dfrac{1}{45}-1\right)\)
\(A=\left(\dfrac{1}{7}+\dfrac{1}{23}-\dfrac{1}{1009}\right):\left(\dfrac{1}{23}+\dfrac{1}{7}-\dfrac{1}{1009}+\dfrac{1}{7}.\dfrac{1}{23}.\dfrac{1}{1009}\right)+1:\left(30.1009-160\right)\)
Tìm \(x\)
1. \(\dfrac{1}{7}=\dfrac{8}{-x}\)
2. \(\dfrac{3x}{9}=\dfrac{2}{6}\)
3. \(4\dfrac{2}{5}:\left(\dfrac{-33}{10}\right)+x=-1\dfrac{5}{6}\)
4. \(45\%.x-2\dfrac{3}{8}=-1\dfrac{31}{40}\)
5. \(\left(x-2\dfrac{1}{4}\right):\left(-\dfrac{5}{6}\right)=3\)
left(dfrac{2}{3}+dfrac{2}{13}+dfrac{2}{11}+dfrac{2}{6}right) left(dfrac{5}{4}+dfrac{5}{7}+dfrac{5}{6}+dfrac{5}{11}right)
___________________ X ___________________
left(dfrac{4}{3}+dfrac{4}{13}+dfrac{4}{11}+dfrac{4}{6}right) left(dfrac{9}{4}+dfrac{9}{7}+dfrac{9}{6}dfrac{9}{11}right)
Đọc tiếp
\(\left(\dfrac{2}{3}+\dfrac{2}{13}+\dfrac{2}{11}+\dfrac{2}{6}\right)\) \(\left(\dfrac{5}{4}+\dfrac{5}{7}+\dfrac{5}{6}+\dfrac{5}{11}\right)\)
___________________ X ___________________
\(\left(\dfrac{4}{3}+\dfrac{4}{13}+\dfrac{4}{11}+\dfrac{4}{6}\right)\) \(\left(\dfrac{9}{4}+\dfrac{9}{7}+\dfrac{9}{6}\dfrac{9}{11}\right)\)
Bài 1: quy đồng mẫu các p/s sau:
a) dfrac{7}{30};dfrac{8}{45};dfrac{11}{90}
b)dfrac{-4}{5};dfrac{1}{6};dfrac{-9}{7}
c)dfrac{-7}{24};dfrac{11}{12};dfrac{-23}{36}
d) dfrac{17}{30};dfrac{-22}{75};5
Đọc tiếp
Bài 1: quy đồng mẫu các p/s sau:
a) \(\dfrac{7}{30}\);\(\dfrac{8}{45}\);\(\dfrac{11}{90}\)
b)\(\dfrac{-4}{5}\);\(\dfrac{1}{6}\);\(\dfrac{-9}{7}\)
c)\(\dfrac{-7}{24}\);\(\dfrac{11}{12}\);\(\dfrac{-23}{36}\)
d) \(\dfrac{17}{30}\);\(\dfrac{-22}{75}\);5
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 ∈ N thoả \(\left(\dfrac{1}{1.2.3}+\dfrac{1}{2.3.4}+....+\dfrac{1}{8.9.10}\right)x=\dfrac{23}{45}\)
Một số tự nhiên chia cho 12 dư 58, chia cho 135 dư 88. Tìm số tự nhiên đó, biết số đó bé nhất.
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