Question

tính :

a) A = 1 - 2 +3 - 4 + 5 - 6+....................+ 101 - 102

b) B = ( -1) +2 +(-3) +4+..........+( -105) + 106

Answer 1

a) A = 1 - 2 + 3 - 4 + 5 - 6 +....................+ 101 - 102

A = (1 - 2) + (3 - 4) + (5 - 6) + ... + (101 - 102)

A = - 1 + (-1) + (-1) + ... + (-1)

A = -1.51

A = -51

b) B = (-1) + 2 + (-3) + 4 +..........+ (-105) + 106

B = (-1 + 2) + (-3 + 4) + ... + (-105 + 106)

B = 1 + 1 + ... + 1

B = 1.53

B = 53