Question

Tìm x

( x +1)+(x+2)+...+(x+100)=5750

Answer 1

(x + 1) + (x + 2) +...+ (x + 100) = 5750

\(x\)x 100 + (1 + 2 + 3 + 4 + ... + 100) = 5750     

\(x\) x 100 = 5750 - 5050

\(x\) x 100 =700

=> x = 700 : 100 = 7

          Đáp số: 7

Answer 2

(x + 1) + (x + 2) + ... + (x + 100) = 5750

(x + x + ... + x) + (1 + 2 + ... + 100) = 5750

    100 số x

100.x + (1 + 100).100:2 = 5750

100.x + 101.50 = 5750

100.x + 5050 = 5750

100.x = 5750 - 5050

100.x = 700

x = 700:100 = 7

Vậy x = 7

Ủng hộ mk nha ☆_☆^_-

Answer 3

Ta có: (x + 1) + (x + 2) +...+ (x + 100) = 5750

=> (x + x + x +...... +x) + (1 + 2 + 3 + 4 + ... + 100) = 5750    

=> 100x + 5050 = 5750

=> 100x = 5750 - 5050

=> 100x = 700

=> x = 700 : 100

=> x = 7