Violympic toán 6
Các câu hỏi tương tự
Cmr : \(\dfrac{1}{3}\) - \(\dfrac{2}{3^2}\) +\(\dfrac{3}{3^3}\) - \(\dfrac{4}{3^4}\) + ...+\(\dfrac{99}{3^{99}}\) - \(\dfrac{100}{3^{100}}\)< \(\dfrac{3}{16}\)
CMR \(\dfrac{1}{3}-\dfrac{2}{3^2}+\dfrac{3}{3^3}-\dfrac{4}{3^4}+...+\dfrac{99}{3^{99}}-\dfrac{100}{3^{100}}< \dfrac{3}{16}\)
Chứng minh rằng:
\(\dfrac{1}{3}-\dfrac{2}{3^2}+\dfrac{3}{3^3}+\dfrac{4}{3^4}+...+\dfrac{99}{3^{99}}-\dfrac{100}{3^{100}}< \dfrac{3}{16}\)
Tính giá trị của biểu thức
A=\(\dfrac{\dfrac{5}{12}+\dfrac{3}{4}-1}{3-\dfrac{5}{6}+\dfrac{2}{3}}\)+\(\dfrac{\dfrac{16}{5}+\dfrac{16}{7}-\dfrac{16}{9}}{\dfrac{17}{5}+\dfrac{17}{7}-\dfrac{17}{9}}\)
3\(\frac{1}{3}\)x+16\(\frac{3}{4}\)= -13,25
1. Tìm x, biết:
a, 1dfrac{3}{5} + dfrac{dfrac{2}{7}+dfrac{2}{17}+dfrac{2}{37}}{dfrac{5}{7}+dfrac{5}{17}+dfrac{5}{37}} . x dfrac{16}{5}
b, (dfrac{1}{24.25} + dfrac{1}{25.26} + . . . + dfrac{1}{39.40} ) . 120 + x. dfrac{1}{3} -4
c, left|x-dfrac{1}{3}right| . 2 + dfrac{4}{5} 0,24
d, dfrac{24}{7x-3} dfrac{-4}{25}
e, ( 50% x + 5dfrac{1}{4} ) , dfrac{-2}{3} 2dfrac{5}{6}
f, 1dfrac{1}{3} - 25%dfrac{-5}{12} + 2x 1,6 : dfrac{3}{5}
Đọc tiếp
1. Tìm x, biết:
a, \(1\dfrac{3}{5}\) + \(\dfrac{\dfrac{2}{7}+\dfrac{2}{17}+\dfrac{2}{37}}{\dfrac{5}{7}+\dfrac{5}{17}+\dfrac{5}{37}}\) . x = \(\dfrac{16}{5}\)
b, (\(\dfrac{1}{24.25}\) + \(\dfrac{1}{25.26}\) + . . . + \(\dfrac{1}{39.40}\) ) . 120 + x. \(\dfrac{1}{3}\) = -4
c, \(\left|x-\dfrac{1}{3}\right|\) . 2 + \(\dfrac{4}{5}\) = 0,24
d, \(\dfrac{24}{7x-3}\) = \(\dfrac{-4}{25}\)
e, ( 50% x + \(5\dfrac{1}{4}\) ) , \(\dfrac{-2}{3}\) = \(2\dfrac{5}{6}\)
f, \(1\dfrac{1}{3}\) - 25%\(\dfrac{-5}{12}\) + 2x = 1,6 : \(\dfrac{3}{5}\)
CMR \(\dfrac{1}{2}-\dfrac{1}{4}+\dfrac{1}{8}-\dfrac{1}{16}+\dfrac{1}{32}-\dfrac{1}{64}< \dfrac{1}{3}\)
1. tìm x
a. \(\dfrac{1}{3}\)+\(\dfrac{1}{2}\):x=4
b. \(\left(x-1\right)^3\)= 27
c. \(\left(2x+1\right)^2\)=16
d. \(\dfrac{x+3}{2}\)=\(\dfrac{3}{5}\)
Tính tổng sau:
a) \(\dfrac{1}{9}+3,25+5\dfrac{3}{16}+4\dfrac{1}{3}+2,8+0,5\)
b) \(2\dfrac{1}{3}+0,45+4,25+\dfrac{1}{81}+6\dfrac{8}{27}\)
c) \(1,25+2\dfrac{1}{4}+4\dfrac{2}{5}+0,3+2,14+4\dfrac{1}{8}\)