Các câu hỏi tương tự
Tính A = \(\frac{M}{N}\)biết
M =\(\frac{\frac{1}{99}+\frac{2}{98}+\frac{3}{97}+...+\frac{99}{1}}{\frac{1}{2}+\frac{1}{3}+\frac{1}{4}+...+\frac{1}{100}}\)
N = \(N=\frac{92-\frac{1}{9}-\frac{2}{10}-\frac{3}{11}-...-\frac{90}{98}-\frac{91}{99}-\frac{92}{100}}{\frac{1}{45}+\frac{1}{50}+\frac{1}{55}+...+\frac{1}{495}+\frac{1}{500}}\)
Cho \(P=\frac{\frac{1}{99}+\frac{2}{98}+\frac{3}{97}+..+\frac{99}{1}}{\frac{1}{2}+\frac{1}{3}+\frac{1}{4}+..+\frac{1}{100}}\)và \(Q=\frac{92-\frac{1}{9}-\frac{2}{10}-\frac{3}{11}-..-\frac{92}{100}}{\frac{1}{45}+\frac{1}{50}+\frac{1}{55}+..+\frac{1}{500}}\)
a)Tính P,Q b) Tính tỉ số % của P và 3Q
Cho \(M=\frac{\frac{1}{99}+\frac{2}{98}+\frac{3}{97}+.......+\frac{99}{1}}{\frac{1}{2}+\frac{1}{3}+\frac{1}{4}....+\frac{1}{100}}\)
\(N=\frac{92-\frac{1}{9}-\frac{2}{10}-\frac{3}{11}-....-\frac{92}{100}}{\frac{1}{45}+\frac{1}{50}+\frac{1}{55}+.....+\frac{1}{495}+\frac{1}{500}}\)
Tính M; N
Dear thảo :))-1-frac{1}{3}-frac{1}{6}-frac{1}{10}-frac{1}{15}-...-frac{1}{45}-1-left(frac{1}{3}+frac{1}{6}+frac{1}{10}+...+frac{1}{45}right)-1-2.left(frac{1}{6}+frac{1}{12}+frac{1}{20}+...+frac{1}{90}right)-1-2.left(frac{1}{2.3}+frac{1}{3.4}+...+frac{1}{9.10}right)-1-2.left(frac{1}{2}-frac{1}{3}+frac{1}{3}-frac{1}{4}+...+frac{1}{9}-frac{1}{10}right)-1-2.left(frac{1}{2}-frac{1}{10}right)-1-2.frac{2}{5}frac{-9}{5}
Đọc tiếp
Dear thảo :))
\(-1-\frac{1}{3}-\frac{1}{6}-\frac{1}{10}-\frac{1}{15}-...-\frac{1}{45}\)
\(=-1-\left(\frac{1}{3}+\frac{1}{6}+\frac{1}{10}+...+\frac{1}{45}\right)\)
\(=-1-2.\left(\frac{1}{6}+\frac{1}{12}+\frac{1}{20}+...+\frac{1}{90}\right)\)
\(=-1-2.\left(\frac{1}{2.3}+\frac{1}{3.4}+...+\frac{1}{9.10}\right)\)
\(=-1-2.\left(\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+...+\frac{1}{9}-\frac{1}{10}\right)\)
\(=-1-2.\left(\frac{1}{2}-\frac{1}{10}\right)\)
\(=-1-2.\frac{2}{5}\)
\(=\frac{-9}{5}\)
1
\(\frac{-2}{3}-\left(\frac{-2}{5}\right)-\frac{7}{10}\)
\((\frac{11}{24}:\frac{55}{36})\times\frac{10}{3}\)
3-\(\left(\frac{-3}{4}\right)^0+\left(\frac{-1}{2}\right):2\)
\((\frac{2}{3})^{21}:\left(\frac{4}{9}\right)^{10}\)
Tính
P= \(\frac{\frac{6}{8}-\frac{6}{10}+\frac{6}{14}+\frac{6}{26}}{\frac{11}{4}+\frac{11}{5}+\frac{11}{7}+\frac{11}{13}}\)
Q=\(\frac{\frac{9}{1}+\frac{8}{2}+.....+\frac{1}{9}}{\frac{1}{2}+\frac{1}{3}+....+\frac{1}{10}}\)
Tính giá trị biểu thức:
3) C= \(\frac{5}{18}+\frac{8}{19}-\frac{7}{21}+\left(\frac{-10}{36}+\frac{11}{19}+\frac{1}{3}\right)-\frac{5}{8}\)\(\frac{5}{8}\)
4) D= \(\frac{1}{9}-\left|\frac{-5}{23}\right|-\left(\frac{-5}{23}+\frac{1}{9}+\frac{25}{7}\right)+\frac{50}{4}-\frac{7}{30}\)
Tìm x biết
a) x+2x+3x+4x+...+100x=-213
b)\(\frac{1}{2}x-\frac{1}{3}=\frac{1}{4}x-\frac{1}{6}\)
c)3(x-2)+2(x-1)=10
d)\(\frac{x+1}{3}=\frac{x-2}{4}\)
e)\(\frac{x-6}{7}+\frac{x-7}{8}+\frac{x-8}{9}=\frac{x-9}{10}+\frac{x-10}{11}+\frac{x-11}{12}\)
f)\(\frac{x+32}{11}+\frac{x+23}{12}=\frac{x+38}{13}+\frac{x+27}{14}\)
Tính hợp lí: \(A=\frac{\frac{2}{5}-\frac{2}{9}+\frac{2}{11}}{\frac{7}{5}-\frac{7}{9}+\frac{7}{11}}:\frac{\frac{1}{3}-\frac{1}{4}+\frac{1}{5}}{\frac{7}{6}-\frac{7}{8}+\frac{7}{10}}\)