Toán |x-y|=13+|-25| 1-5+9-13+…-x=400 giúp mình với 12/10/2021 By Ayla |x-y|=13+|-25| 1-5+9-13+…-x=400 giúp mình với
`|x-y|=13+|-25|` `| x – y | = 38 ` Vì ` = 38 `nên `\(\left[ \begin{array}{l}x=+ 38\\y=-38\end{array} \right.\) ` `1-5+9-13+…-x=400` ` -4 + – 4 + … – x = 400` `[400 . ( – 4 ) : -2 ] – [( 13 – 25 ) : – 4 ] = 797 ` `( – 2 là từ : -4 = -2 . 2 )` vậy x = `797` xin hay nhất Trả lời
`|x-y|=13+|-25|` `⇒|x-y|=13+25` `⇒|x-y|=38` `⇒`\(\left[ \begin{array}{l}x-y=38\\x-y=-38\end{array} \right.\) `⇒`\(\left[ \begin{array}{l}x=y+38\\x=y-38\end{array} \right.\) `1-5+9-13+…-x=400` `⇒(1-5)+(9-13)+…+(x-4-x)=400` `⇒(-4)+(-4)+…+(-4)=400 ` Có `1/2.[(x+3)/4]` số`(-4)` `⇒1/2.(-4). (x+3)/4 =400` `⇒x=797` Vậy `x=797` Trả lời
`|x-y|=13+|-25|`
`| x – y | = 38 `
Vì ` = 38 `nên
`\(\left[ \begin{array}{l}x=+ 38\\y=-38\end{array} \right.\) `
`1-5+9-13+…-x=400`
` -4 + – 4 + … – x = 400`
`[400 . ( – 4 ) : -2 ] – [( 13 – 25 ) : – 4 ] = 797 ` `( – 2 là từ : -4 = -2 . 2 )`
vậy x = `797`
xin hay nhất
`|x-y|=13+|-25|`
`⇒|x-y|=13+25`
`⇒|x-y|=38`
`⇒`\(\left[ \begin{array}{l}x-y=38\\x-y=-38\end{array} \right.\)
`⇒`\(\left[ \begin{array}{l}x=y+38\\x=y-38\end{array} \right.\)
`1-5+9-13+…-x=400`
`⇒(1-5)+(9-13)+…+(x-4-x)=400`
`⇒(-4)+(-4)+…+(-4)=400 ` Có `1/2.[(x+3)/4]` số`(-4)`
`⇒1/2.(-4). (x+3)/4 =400`
`⇒x=797`
Vậy `x=797`