Tìm x: ($\frac{1}{4}$x -1) + ($\frac{5}{6}$x-2) – ($\frac{3}{8}$x + 1) = 4,5 02/09/2021 Bởi Josie Tìm x: ($\frac{1}{4}$x -1) + ($\frac{5}{6}$x-2) – ($\frac{3}{8}$x + 1) = 4,5
Đáp án: `x=12` Giải thích các bước giải: `(1/4x-1)+(5/6x-2)-(3/8x+1)=4,5` `=>1/4x-1+5/6x-2-3/8x-1=4,5` `=>(1/4x+5/6x-3/8x)+(-1-2-1)=4,5` `=>17/24x-4=4,5` `=>17/24x=17/2` `=>x=12` Vậy `x=12` Bình luận
( $\frac{1}{4}$. x–1) +( $\frac{5}{6}$ x-2) -($\frac{3}{8}$ x+1) = 4,5 ⇔ $\frac{1}{4}$. x-1 + $\frac{5}{6}$ x-2 -$\frac{3}{8}$ x-1 = 4,5 ⇔ $\frac{6}{24}$. x-1 + $\frac{20}{24}$.x-2 -$\frac{9}{24}$ x-1 = $\frac{9}{2}$ ⇔$\frac{6+20-9}{24}$. x-1 -2 -1 – $\frac{9}{2}$ =0 ⇔$\frac{6+20-9}{24}$. x-4- $\frac{9}{2}$ =0 ⇔$\frac{6+20-9}{24}$. x-$\frac{8}{2}$ – $\frac{9}{2}$ =0 ⇔$\frac{17}{24}$. x-$\frac{17}{2}$ =0 ⇔$\frac{17}{24}$. x=$\frac{17}{2}$ ⇔x= $\frac{17}{2}$ : $\frac{17}{24}$ ⇔x =$\frac{17}{2}$ . $\frac{24}{17}$ ⇔x= 12 Vậy … Bình luận
Đáp án:
`x=12`
Giải thích các bước giải:
`(1/4x-1)+(5/6x-2)-(3/8x+1)=4,5`
`=>1/4x-1+5/6x-2-3/8x-1=4,5`
`=>(1/4x+5/6x-3/8x)+(-1-2-1)=4,5`
`=>17/24x-4=4,5`
`=>17/24x=17/2`
`=>x=12`
Vậy `x=12`
( $\frac{1}{4}$. x–1) +( $\frac{5}{6}$ x-2) -($\frac{3}{8}$ x+1) = 4,5
⇔ $\frac{1}{4}$. x-1 + $\frac{5}{6}$ x-2 -$\frac{3}{8}$ x-1 = 4,5
⇔ $\frac{6}{24}$. x-1 + $\frac{20}{24}$.x-2 -$\frac{9}{24}$ x-1 = $\frac{9}{2}$
⇔$\frac{6+20-9}{24}$. x-1 -2 -1 – $\frac{9}{2}$ =0
⇔$\frac{6+20-9}{24}$. x-4- $\frac{9}{2}$ =0
⇔$\frac{6+20-9}{24}$. x-$\frac{8}{2}$ – $\frac{9}{2}$ =0
⇔$\frac{17}{24}$. x-$\frac{17}{2}$ =0
⇔$\frac{17}{24}$. x=$\frac{17}{2}$
⇔x= $\frac{17}{2}$ : $\frac{17}{24}$
⇔x =$\frac{17}{2}$ . $\frac{24}{17}$
⇔x= 12
Vậy …