Register Now

Login

Lost Password

Lost your password? Please enter your email address. You will receive a link and will create a new password via email.

222-9+11+12:2*14+14 = ? ( )

Toán Lớp 6: Tính tổng : ( -1 ) + 2 – 3 + 4 – 5 + 6 – – – 99 + 100

Toán Lớp 6: Tính tổng :
( -1 ) + 2 – 3 + 4 – 5 + 6 – …. – 99 + 100

Comments ( 2 )

  1. Ta có : $\text{( -1 ) + 2 – 3 + 4 – 5 + 6 – …. – 99 + 100 }$
              $\text{= ( -1 + 2 ) + ( -3 + 4 ) + ( -5 + 6 ) + …. + ( -99 + 100 ) }$
              $=$ $\underbrace{1 + 1 + 1 + …. + 1}_{$\frac{100}{2}$ số 1}$
              $=$ $1$ . $\frac{100}{2}$ = $1$ . $50$ = $50$
               

  2. ( -1 ) + 2 – 3 + 4 – 5 + 6 – …. – 99 + 100

    = 1.50 – 101

    = 50-101 = -51.

Leave a reply

222-9+11+12:2*14+14 = ? ( )

About Linh