(3/4x-8/13).(2,5+-7/5:x)=0 giúp e câu trên vs ạ 25/07/2021 Bởi Josephine (3/4x-8/13).(2,5+-7/5:x)=0 giúp e câu trên vs ạ
`(3/4x-8/13).(2,5+ -7/5÷x)=0` `3/4x-8/13=0` hoặc `2,5+ -7/5÷x=0` $\text{* $\dfrac{3}{4}$x – $\dfrac{8}{13}$ = 0.}$ `⇒3/4x=0+8/13.` `⇒3/4x=8/13.` `⇒x=8/13÷3/4.` `⇒x=8/13. 4/3.` `⇒x=32/39.` $\text{* 2,5 + $\dfrac{-7}{5}$ ÷ x= 0.}$ `⇒-7/5÷x=0-2,5` `⇒-7/5÷x=-2,5` `⇒x=-7/5÷-2,5` `⇒x=-7/5÷-25/10` `⇒x=-7/5. -10/25` `⇒x=14/25` $\text{Vậy x = $\dfrac{32}{39}$ hoặc x = $\dfrac{14}{25}$.}$ Bình luận
Đáp án: Giải thích các bước giải: `(3/4. x- 8/13). (2,5+ -7/5: x)= 0` `→ 3/4. x- 8/13= 0` hoặc `2,5+ -7/5: x= 0` `TH1: 3/4. x- 8/13= 0` `3/4. x= 0+ 8/13` `3/4. x= 8/13` `x= 8/13: 3/4` `x= 32/39` `TH2: 2,5+ -7/5: x= 0` `-25/10+ -7/5: x= 0` `-7/5: x= 0- -25/10` `-7/5: x= -25/10` `x= -7/5: -25/10` `x= 14/25` Vậy `x= 32/39′ -14/-25` Bình luận
`(3/4x-8/13).(2,5+ -7/5÷x)=0`
`3/4x-8/13=0` hoặc `2,5+ -7/5÷x=0`
$\text{* $\dfrac{3}{4}$x – $\dfrac{8}{13}$ = 0.}$
`⇒3/4x=0+8/13.`
`⇒3/4x=8/13.`
`⇒x=8/13÷3/4.`
`⇒x=8/13. 4/3.`
`⇒x=32/39.`
$\text{* 2,5 + $\dfrac{-7}{5}$ ÷ x= 0.}$
`⇒-7/5÷x=0-2,5`
`⇒-7/5÷x=-2,5`
`⇒x=-7/5÷-2,5`
`⇒x=-7/5÷-25/10`
`⇒x=-7/5. -10/25`
`⇒x=14/25`
$\text{Vậy x = $\dfrac{32}{39}$ hoặc x = $\dfrac{14}{25}$.}$
Đáp án:
Giải thích các bước giải:
`(3/4. x- 8/13). (2,5+ -7/5: x)= 0`
`→ 3/4. x- 8/13= 0` hoặc `2,5+ -7/5: x= 0`
`TH1: 3/4. x- 8/13= 0`
`3/4. x= 0+ 8/13`
`3/4. x= 8/13`
`x= 8/13: 3/4`
`x= 32/39`
`TH2: 2,5+ -7/5: x= 0`
`-25/10+ -7/5: x= 0`
`-7/5: x= 0- -25/10`
`-7/5: x= -25/10`
`x= -7/5: -25/10`
`x= 14/25`
Vậy `x= 32/39′ -14/-25`