Tính nhanh:
1+(1+2)+(1+2+3)+(1+2+3+4)+.......+(1+2+3+...+100)/100x1+99x2+98x3+.........+2x99+1x100.
Tính nhanh:
\(\frac{1+(1+2)+(1+2+3)+(1+2+3+4)+.......+(1+2+3+...+100)}{100x1+99x2+98x3+.........+2x99+1x100}\)
Tính giá trị biểu thức bằng cách nhanh nhất
(2000x7,5+2012:3)x(21-3,5x0,25)x(11,2-10-1,2)x(3,75-0,75)/2011+3,14
1+(1+2)+(1+2+3)+(1+2+3+4)+...+(1+2+3+...+100)/100x1+99x2+98x3+...+2x99+1x100
Tính A =1+(1+2)+(1+2+3)+........+(1+2+3+..........+100) / 100 x 1+99x2+97x3+...........+ 2x99+1x100
Tính A = 1+( 1+2)+(1+2+3)+..........+(1+2+3+.......+100)
100x1+99x2+97x3+...........+ 2x99+1x100
Tính A = 1+( 1+2)+(1+2+3)+..........+(1+2+3+.......+100)
100x1+99x2+97x3+...........+ 2x99+1x100
1+(1+2)+(1+2+3)+. . .+(1+2+3+...+100) / 1x100+2x99+3x98+...+100x1
1+(1+2)+(1+2+3)+...+(1+2+...+100) /1x100+2x99+3x98+...+100x1
Tính
a) (x-1/2)+(x-1/4)+(x-1/8)+...+(x-1/512)
Tìm x
a) (x-1/1×2)+(x-1/2×3)+...+(x-1/100×101)
b) (x-1)+(x-2)+(x-3)+...+(x-101)=5050
c) x+1/2+1/3+1/4+...+1/100=3/2+4/3+5/4++...+101/100
