Question

Tìm x:

x+(x+1)+(x+2)+(x+3)+.............+(x+30)=1240

Answer 1

\(\text{x+(x+1)+(x+2)+(x+3)+.............+(x+30)=1240}\)

\(=x+x+1+x+2+x+3+...+x+30=1240\)

\(=31x+1+2+3+...+30=1240\)

\(=31x+465=1240\)

\(\Rightarrow31x=1240-465=775\)

\(\Rightarrow x=775:31=25\)

Answer 2

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Answer 3

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Answer 4

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