C=6/1.2+6/2.3+6/3.4+...+6/98.99+6/99.100
C=3/1-3/2+3/2-3/3+3/3-3/4+...+3/98-3/99+3/99-3/100(tối giản các phân số giống nhau)
C=3/1-3/100
C=297/100
(1.2+2.3+3.4 +...+98.99).x/26950 =12và 6/7 :1,5
( 1.2 + 2.3 + 3.4 + ...... + 98.99 ) x / 26950 = 12/6/7 : 3/2
1.2+2.3+3.4+...+98.99+99.100
1.2+2.3+3.4+4.5+...+98.99+99.100=?
B=1.2+2.3+3.4+...+98.99+99.100
1.2+2.3+3.4+4.5+.....+97.98+98.99+99.100
Tính : A = 1.2 + 2.3 + 3.4 + ..... + 98.99 + 99.100
Tính : A = 1.2 + 2.3 + 3.4 + ..... + 98.99 + 99.100
tính A=1.2+2.3+3.4+4.5+.........................+98.99+99.100
