Question

tìm x

( x+1) + (x+2)+...+(x+100)=5750

Answer 1

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Answer 2

Có 100 số hạng

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

2x+101=11500

2x=11399

x=5699,5

Answer 3

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

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

          co 100 so x

\(\Leftrightarrow\) 100x+5050=5750

\(\Leftrightarrow\) 100x = 5750 -5050=700

\(\Leftrightarrow\) x= 700:100 =7

Vay x =7