( x + 1 ) + ( x + 2 ) + ( x + 3 ) + ... + ( x + 100 ) =5750
( x + x + x + ... + x ) + ( 1 + 2 + 3 + ... + 100 ) = 5750
100x + 5050 = 5750
100x = 5750 - 5050
100x = 700
x = 700 : 100
x = 7
\(\left(x+1\right)+\left(x+2\right)+\left(x+3\right)+....+\left(x+100\right)=5750\)
\(\Leftrightarrow\left(x+x+x+....+x\right)+\left(1+2+3+...+100\right)=5750\)
\(\Leftrightarrow100x+\frac{\left(1+100\right).100}{2}=5750\)
\(\Leftrightarrow100x+5050=5750\)
\(\Leftrightarrow100x=700\)
\(\Leftrightarrow x=7\)
( x + 1 ) + ( x + 2 ) + ( x + 3 ) + ... + ( x + 100 ) =5750
( x + x + x + ... + x ) + ( 1 + 2 + 3 + ... + 100 ) = 5750
100x + 5050 = 5750
100x = 5750 - 5050
100x = 700
x = 700 : 100
x = 7
Vậy x = 7
( x + 1 ) + ( x + 2 ) + ( x + 3 ) + .... + ( x + 100 ) = 5750
( x + x + x + ....+ x ) + ( 1 + 2 + 3 + ....+ 100 ) = 5750
100 x + 5050 = 5750
100 x = 5750 - 5050
100 x = 700
x = 700 : 100
x = 7
Vậy x = 7
♥ Ủng hộ mk nha nếu thấy đúng ♥
( x + 1 ) + ( x + 2 ) + ( x + 3 ) + ... + ( x + 100 ) = 5750
( x + x + x + ... + x ) + ( 1 + 2 + 3 + ... + 100 ) = 5750
x X 100 + 5050 = 5750
x X 100 = 5750 - 5050 = 700
x = 700 : 100 = 7
(x+1)+(x+2)+(x+3)+....+(x+100)=5750
(x+x+x+...+x)+(1+2+3+....+100)=5750
100x+5050=5750
100x =5750-5050
100x =700
x =700:100
x =7
