Tìm x, biết a)4(x-1)+5=3(x+2)-26 b) -3(x+5)-(-32)=-2.(x-1)+(-23) c) 3x+2-2.(x-1)=3x+6 Giúp mik zới mn ơi!!!😭😭
2 câu trả lời
Đáp án:
`a)`
`4(x-1)+5=3(x+2)-26`
`⇒4.x-4.1+5=3.x+3.2-26`
`⇒4x+1=3x-20`
`⇒4x-3x=-20-1`
`⇒x.(4-3)=-20-1`
`⇒x=-21`
Vậy `x=-21`
`b)`
`-3.(x+5)-(-32)=-2.(x-1)+(-23)`
`⇒-3.x-15+32=-2x+2-23`
`⇒-3x+17=-3x-21`
`⇒-3x+2x=-21-17`
`⇒x.(-3+2)=-38`
`⇒-1.x=-38`
`⇒x=38`
Vậy `x=38`
`c)`
`3x+2-2.(x-1)=3x+6`
`⇒3x+2-2x+2=3x+6`
`⇒3x-2x+1=3x+6`
`⇒x.(3-2)+1=3x+6`
`⇒x+4=3x+6`
`⇒x-3x=6-4`
`⇒x(1-3)=2`
`⇒-2.x=2`
`⇒x=-1`
Vậy `x=-1`
#andy
\[\begin{array}{l}
a)4\left( {x - 1} \right) + 5 = 3\left( {x + 2} \right) - 26\\
\Leftrightarrow 4x - 4 + 5 = 3x + 6 - 26\\
\Leftrightarrow 4x - 3x = 6 - 26 - 5 + 4\\
\Leftrightarrow x = - 21\\
\Leftrightarrow x = - 21\\
b){\rm{ }} - 3\left( {x + 5} \right) - \left( { - 32} \right) = - 2.\left( {x - 1} \right) + \left( { - 23} \right)\\
\Leftrightarrow - 3x - 15 + 32 = - 2x + 2 - 23\\
\Leftrightarrow - 3x + 2x = 2 - 23 - 32 + 15\\
\Leftrightarrow - x = - 38\\
\Leftrightarrow x = 38\\
c){\rm{ }}3x + 2 - 2.\left( {x - 1} \right) = 3x + 6\\
\Leftrightarrow 3x + 2 - 2x + 2 = 3x + 6\\
\Leftrightarrow 3x - 2x - 3x = 6 - 2 - 2\\
\Leftrightarrow - 2x = 2\\
\Leftrightarrow x = - 1
\end{array}\]