Question

(X x 1)+(X x 2)+.....+(X x10)=110                                                                      Ai nhanh nhanh giúp mk với!Mk cần rất rất gấp

 

Answer 1

\(\left(x+1\right)+\left(x+2\right)+...+\left(x+10\right)=110\)

\(\left(x+x+...+x\right)+\left(1+2+3+...+10\right)=110\)

\(10x+55=110\)

\(10x=110-55\)

\(10x=55\)

\(x=55:10\)

\(x=5,5\)

 

Answer 2

\(10xX+\left(1+2+3+...+10\right)=110\)

\(1+2+3+...+10=\dfrac{10\left(1+10\right)}{2}=55\)

\(\Rightarrow10xX+55=110\Rightarrow10xX=55\)

\(\Rightarrow X=55:10=5,5\)