Question

Tinh A=1+2-3-4+5+6-7-8+...-111-112+113+114
giup minh nhe
 

Answer 1

áp dụng công thức \(\frac{n\left(n-1\right)}{2}\)

<=>\(\frac{114\cdot\left(114-1\right)}{2}\)

<=> A =6441

Answer 2

A=1+2-3-4+5+6-7-8+...-111-112+113+114

A=1+(2-3-4+5)+(6-7-8+9)+...+(110-111-112+113)+114

A=1+ 0           +0 +.........+0+114

A=115

Answer 3

A = 1 + 2 - 3 - 4 + 5 + 6 - 7 - 8 + ... - 111 - 112 + 113 + 114 ( có 114 số, 114 chia 4 dư 2)

A = 1 + ( 2 - 3 - 4 + 5) + ( 6 - 7 - 8 + 9) + ... + ( 110 - 111 - 112 + 113) + 114

A = 1 + 0 + 0 + ... + 0 + 114

A = 115 + 0

A = 115