Câu hỏi của PHAN MAI ANH

Question

(2+4+6+...+2004) . x =501396

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Ngô Chi Lan · Accepted Answer

Ta có: $\left(2+4+6+...+2004\right)\cdot x=501396$

$\Leftrightarrow\frac{\left(2+2004\right)\cdot\left[\left(2004-2\right)\div2+1\right]}{2}\cdot x=501396$

$\Leftrightarrow\frac{2006\cdot1002}{2}\cdot x=501396$

$\Leftrightarrow1005006\cdot x=501396$

$\Rightarrow x=\frac{250698}{502503}$

Câu trả lời:

Ta có: $\left(2+4+6+...+2004\right)\cdot x=501396$

$\Leftrightarrow\frac{\left(2+2004\right)\cdot\left[\left(2004-2\right)\div2+1\right]}{2}\cdot x=501396$

$\Leftrightarrow\frac{2006\cdot1002}{2}\cdot x=501396$

$\Leftrightarrow1005006\cdot x=501396$

$\Rightarrow x=\frac{250698}{502503}$