1+1+1+1+2+2+2+2+3+3+3+3+...+99+99+99+99+100+100+100+100=?

(1+97)*(1+97/2)*(1+97/3)*(1+97/4)... ... ...(1+97/99) 

(1+99)*(1+99/2)*(1+99/3)*(1+99/4)... ... ...(1+99/97) 

tinh tong gia tri bieu thuc :

a)A=1+1/3+1/5+...+1/97+1/99/1/1*99+1/3*97+1/5*95+...+1/97*3+1/99*1

b)B=1/2+1/3+1/4+...+1/100/99/1+98/2+97/3+...+1/99

tính nhanh (2/3+3/4+5/6+...+99/100).(1/2+2/3+3/4+...+98/99)-(1/2+1/3+...+99/100).(2/3+2/4+...+98/99)

E=(1+1/3+1/5+........+1/97+1/99)/(1/1*99+1/3*97+1/5*95+.....+1/97*3+1/99*1)

4+3/5+3/7+...+3/95+3/97+3/99

1/99+1/3*97+1/5*95+..+1/95*5+1/97*3+1/99*1

Tính

A=1.(100-1)+2.(100-2)+3.(100-3)+..............+99.(100-99)

B=1.(100+1)+2.(100+2)+3.(100+3)+...........+99.(100+99)

(2+4+6+...+100) - (1+3+5+...+99) = ?

1 x 2 + 2 x 3 + 3 x 4 + ... + 99 x 100 = ?

3 x 4 + 4 x 5 + 5 x 6 + ... + 149 x 150 = ?

1 + (1 + 2) + ( 1 + 2 + 3) + (1 + 2 + 3 + 4) + ....... + (1 + 2 + 3 + ... + 99)

----------------------------------------------------------------------------------------------------------- ( gạch ngang phân số )

1 x 99 + 2.98 + 3.97 + ...... + 99 x 1

\(99^{99}\)-\(\left\{1,\left(3\right)-\left[5\times2^3-\left(-7^2\right)+\dfrac{1}{3}+99^9\times\left(27^4-81^3-99^{90}\right)\right]\right\}\)