Ta có :
\(\frac{1+\left(1+2\right)+\left(1+2+3\right)+...+\left(1+2+...+100\right)}{1\times100+2\times99+3\times98+...+100\times1}\)
\(=\frac{\left(1+1+...+1\right)+\left(2+2+..+2\right)+\left(99+99\right)+100}{1\times100+2\times99+...+100\times1}\)
\(=\frac{1\times100+2\times99+...+100\times1}{1\times100+2\times99+...+100\times1}\)
\(=1\)
1+(1+2)+(1+2+3)+...+(1+2+...+100) /1x100+2x99+3x98+...+100x1
1+(1+2)+(1+2+3)+. . .+(1+2+3+...+100) / 1x100+2x99+3x98+...+100x1
tínhA = \(\left(1+\frac{1}{2}\right).\left(1+\frac{1}{3}\right).\left(1+\frac{1}{4}\right)......\left(1+\frac{1}{100}\right)\)
Tính giá trị biểu thức :
\(\left(1-\frac{1}{2}\right)\cdot\left(1-\frac{1}{3}\right)\cdot\left(1-\frac{1}{4}\right)\cdot....\cdot\left(1-\frac{1}{99}\right)\cdot\left(1-\frac{1}{100}\right)\)
\(\frac{\left(\frac{1}{2}+0,25+\frac{1}{4}\right)+\left(\frac{1}{8}+\frac{3}{2}+\frac{1}{8}+\frac{25}{100}\right)+\left(0,75+\frac{1}{2}+50\%+\frac{1}{4}+0,55+\frac{145}{100}\right)}{1x2x3}\)
\(\left(1+\frac{1}{2}\right)+\left(1+\frac{1}{3}\right)+\left(1+\frac{1}{4}\right)+........+\left(1+\frac{1}{100}\right)\)
Ai lm đc có lời giải mk tk nha.Kb nữa
tính nhanh:\(\frac{\left(\frac{1}{2}+0,25+\frac{1}{4}\right)+\left(\frac{1}{8}+\frac{3}{2}+\frac{1}{8}+\frac{25}{100}\right)+\left(0,75+\frac{1}{5}+50\%+\frac{1}{4}+0,55+\frac{45}{100}\right)}{1x2x3}\)
\(\left[\frac{1}{1}-\frac{1}{2}\right]nhân\left[\frac{1}{1}-\frac{1}{3}\right]nhân......................\left[\frac{1}{1}-\frac{1}{100}\right]\)
\(\frac{1+\left(1+2\right)+\left(1+2+3\right)+...+\left(1+2+3+4+...+100\right)}{1.100+2.99+3.98+4.96+...+100.1}\)
