Question

tim x biet : (x+1)+(x+2)+(x+3)+...+(x+100)=5550

Answer 1

=> (x+1+x+100) x 100 : 2 = 5550

=> (2x+101) x 100 = 5550 x 2 = 11100

=> 2x+101 = 11100 + 100 = 111

=> 2x = 111-101 = 10

=> x = 10 : 2 = 5

k mk nha

Answer 2

(x+1)+(x+2)+(x+3)+...+(x+100)=5550

=> (x+x+x+...+x)+...+(1+2+3+...+100)=5550

=> 100x+5050=5550

100x=5550-5050

100x=500

x=500:100

x=5