mình ra = 303 còn cach lam thì chịu

\(1+2-3-4+5+6-7-8+...-300+301\)

\(=1+\left(2-3-4+5\right)+\left(6-7-8+9\right)+...+\left(298-299-300+301\right)\)

\(=1+0+0+...+0\)

\(=1\)

A = 1 + 2 - 3 - 4 + 5 + 6 - 7 - 8 + 9 + 10 -...- 299 - 300 + 301 + 302

A =1+(2 -3 - 4 + 5) + (6 - 7 - 8 + 9) +....+ (298 - 299 - 300 + 301)+ 302

A = 1 + 0 +....+ 0 + 302

A = 303

Lời giải:

Gọi tổng trên là $S$

$S=(1+2-3-4)+(5+6-7-8)+....+(297+298-299-300)+301+302$

$=\underbrace{(-4)+(-4)+....+(-4)}_{75}+301+302$

$=(-4).75+301+302=303$

 chia thành:

1 + (2-3-4+5) + (6-7-8+9)+....+(298-299-300+301) + 302

= 1 + 0 + 0 + 0 + .....+ 0 + 302

= 1+302

= 303

Đề bài mk ko viết lại nữa

=> 1 + ( 2 - 3 - 4 + 5 ) + ( 6 - 7 - 8 + 9 ) + ( 10 - 11 - 12 + 13 ) + ........... + ( 298 - 299 - 300 + 301 ) +  302

= 1 + 0 + 0 + 0 + ........... + 0 + 302

=> 1 + 302 = 303

a, A=50(100+2):2-49(97+1):2=149

b, B=(1-3)+(2-4)+(5-7)+(6-8)+...+(297-299)+(298-300)+301+302

      =-2-2-2-...-2+301+302(150 chữ số 2)

      =-2.150+603

      =330

Bài làm :

\(35.13+35.17+65.75-65.45\)

\(=35.\left(13+17\right)+65.\left(75-45\right)\)

\(=\left(35+65\right).30\)

\(=100.30\)

\(=3000\)

Học tốt

35 . 13 + 35 . 17 + 65 . 75 - 65 . 45

= 35 . (13 + 17) + 65 . (75 - 45)

= 35 . 30 + 65 . 30

= (35 + 65) . 30

= 100 . 30

= 3000

 \(35\cdot13+35\cdot17+65\cdot75-65\cdot45\)

\(=35\cdot\left(13+17\right)+65\cdot\left(75-45\right)\)

\(=35\cdot30+65\cdot30\)

\(=\left(35+65\right)\cdot30\)

\(=100\cdot30\)

\(=3000\)

1+2-3-4+5+6-7-8+9+10-11-12+.....-299-300+301+302

=1+(2-3)+(-4+5)+(6-7)+(-8+9)+(10-11)+... +(-300+301)+302

= 1-1+1-1+1-1+...-1+302

= 302

1+2-3-4+5+6-7-8+9+10-11-12+13+...+298-299-300+301+302

=1+2+(5-3)+(6-4)+...+(302-300)

=1+2+2+2+2+...+2

          151 số 2

=1+151.2

=1+302

=303

1 + 2 - 3 - 4 + 5 + 6 - 7 - 8 + ... - 299 - 300 + 301 + 302 = 1 + (2 - 3 - 4 + 5) + (6 - 7 - 8 + 9) + ... + (298 - 299 - 300 + 301) + 302

= 303

\(1+2-3-4+5+6-......-299-300+301+302\)

\(=1+\left(2-3-4+5\right)+\left(6-7-8+9\right)+.....+\left(298-299-300+301\right)+302\)

\(=1+0+0+0+....+302\)

\(=303\)

=1+(2-3-4+5)+(6-7-8+9)+...+(298-299-300+301)+302

=1+0+0+....+0+302

=1+302

=303