Các câu hỏi tương tự
So sánh \(A\)với\(13\),biết rằng:
\(A=\frac{13}{15}+\frac{7}{5}+\frac{3}{4}+\frac{1}{5}+\frac{1}{7}+\frac{19}{20}+\frac{5}{4}+\frac{1}{3}+\frac{1}{6}+\frac{1}{13}+\frac{17}{23}+\frac{9}{8}+\frac{2}{5}+\frac{1}{7}+\frac{1}{25}+\frac{3}{2}+\frac{1}{8}+\frac{1}{19}+\frac{1}{9}+\frac{1}{97}\)
B=\(\frac{5}{7}.\frac{14}{11}-\frac{5}{7}.\frac{5}{11}-\frac{5}{11}.\frac{2}{7}\)
C=\(1+\frac{2}{6}+\frac{2}{12}+\frac{2}{20}+\frac{2}{30}+\frac{2}{42}\)
D=\(\frac{0,75-0,6+\frac{3}{19}+\frac{3}{19}}{2,75-2,2+\frac{11}{19}+\frac{11}{91}}\)
\(A=\frac{1+3+5+...+19}{21+23+25+..+39}\)
\(B=\frac{1.3.5...39}{21.22.23...40}\)
\(C=\frac{\left(6\frac{1}{2}-8\right):0,05}{\left(7\frac{1}{20}-5,65\right).6+1\frac{3}{5}}\)
ai giai dc xin cam on !
Tính cách thuận tiện nhất : \(\frac{7}{19}\times\frac{1}{3}+\frac{7}{19}\times\frac{2}{3}\)
\(\frac{1}{5\cdot6}+\frac{1}{6\cdot7}+\frac{1}{7\cdot8}+...+\frac{1}{18\cdot19}+\frac{1}{19\cdot20}=?\)
Tính giá trị biểu thức sau sao cho hợp lí
\(\frac{19}{13}+\frac{14}{16}+\frac{1}{9}+\frac{\text{4}}{6}+\frac{7}{13}+\frac{17}{9}\)
\(10:\frac{5}{3}\) \(\frac{5}{3}:10\)
\(\frac{12}{35}:\frac{36}{25}=\) \(\frac{19}{17}:\frac{76}{51}=\)
\(6\frac{1}{7}x1\frac{6}{43}=\) \(9\frac{1}{5}:4\frac{3}{5}=\)
Tính :
a) 3,5 x 2 + 1,25 x 4
b) \(\frac{3}{4}+2\times\left(\frac{1}{2}-\frac{1}{15}\right)\)
c) \(\frac{7}{11}\times\frac{1}{19}+\frac{7}{11}\times\frac{8}{19}-\frac{4}{11}\)
tính bằng cách thuận tiện nhất
a) \(\frac{3}{5}\times\frac{8}{27}\times\frac{5}{3}\)
b) \(\frac{7}{19}\times\frac{1}{3}\times\frac{7}{19}\times\frac{2}{3}\)