giúp mình bài 4 và bài 5 với ạ
`a, 18(x-16)=-36`
`=>x-16=-36:18`
`=>x-16=-2`
`=>x=-2+16`
`=>x= 14`
`b,(-12-x):(-5)=3`
`=>-12-x=3 . (-5)`
`=>-12-x=-15`
`=>x= -12-(-15)`
`=>x=-12+15`
`=>x= 3`
`c,11-(-53+x)=97`
`=>-53+x=11-97`
`=>-53+x=-86`
`=>x=-86-(-53)`
`=>x=-86+53`
`=>x= -33`
`d,-9.x+(-7).x=-48`
`=> [-9+(-7) ].x=-48`
`=>-16.x=-48`
`=>x=-48:(-16)`
`=>x= 3`
`e,(2x-1)^3=-27`
`=> (2x-1)^3=-3^3`
`=> 2x-1=-3`
`=>2x=-3+1`
`=>2x=-2`
`=>x=-2:2`
`=>x=-1`
bn tách ra nhé!
Bài 5 :
\(a,5x-16=40+x\)
\(\Leftrightarrow5x-x=40+16\)
\(\Leftrightarrow4x=56\)
\(\Leftrightarrow x=14\)
\(b,-41+2x-\left(-24\right)=4x-23-x\)
\(\Leftrightarrow-41+2x+24=4x-23-x\)
\(\Leftrightarrow2x-4x+x=41-24-23\)
\(\Leftrightarrow-x=-6\)
\(\Leftrightarrow x=6\)
\(c,2\left(x-5\right)-\left(x+6\right)=\left(-7\right)^2\)
\(\Leftrightarrow2x-10-x-6=49\)
\(\Leftrightarrow x=65\)
\(d,120-4\left(1-x\right)=106-3x\)
\(\Leftrightarrow120-4+4x=106-3x\)
\(\Leftrightarrow4x+3x=106-120+4\)
\(\Leftrightarrow7x=-10\)
\(\Leftrightarrow x=-\dfrac{10}{7}\)
\(a.18\left(x-16\right)=-36\\ x-16=-36:18\\ x-16=-2\\ x=-2+16\\ x=-14\\ b.\left(-12-x\right):\left(-5\right)=3\\ -12-x=3.\left(-5\right)\\ -12-x=-15\\ x=-12-\left(-15\right)\\ x=-12+15\\ x=3\\ c,11-\left(-53+x\right)=97\\ -53+x=11-97\\ -53+x=-86\\ x=-86-\left(-53\right)\\ x=-86+53\\ x=-33\\ d.-9x+\left(-7\right)x=-48\\ \left(-9+\left(-7\right)\right)x=-48\\ -16x=-48\\ x=-48:\left(-16\right)\\ x=3\)
\(e.\left(2x-1\right)^3=-27\\ \left(2x-1\right)^3=\left(-3\right)^3\\ 2x-1=-3\\ 2x=-3+1\\ 2x=-2\\ x=-2:2\\ x=-1\\ f.26-\left(x+18\right)^2=-23\\ \left(x+18\right)^2=26-\left(-23\right)\\ \left(x+18\right)^2=26+23\\ \left(x+18\right)^2=49\\ \left(x+18\right)^2=7^2=\left(-7\right)^2\\ \left[{}\begin{matrix}x+18=7\\x+18=-7\end{matrix}\right.\\ \left[{}\begin{matrix}x=7-18\\x=-7-18\end{matrix}\right.\\ \left[{}\begin{matrix}x=-11\\x=-25\end{matrix}\right.\\ g.5\left(x+6\right)+1=-19\\ 5\left(x+6\right)=-19-1\\ 5\left(x+6\right)=-20\\ x+6=-20:5\\ x+6=-4\\ x=-4-6\\ x=-10\)
a,18(x−16)=−36a,18(x-16)=-36
⇒x−16=−36:18⇒x-16=-36:18
⇒x−16=−2⇒x-16=-2
⇒x=−2+16⇒x=-2+16
⇒x=14⇒x=14
b,(−12−x):(−5)=3b,(-12-x):(-5)=3
⇒−12−x=3.(−5)⇒-12-x=3.(-5)
⇒−12−x=−15⇒-12-x=-15
⇒x=−12−(−15)⇒x=-12-(-15)
⇒x=−12+15⇒x=-12+15
⇒x=3⇒x=3
c,11−(−53+x)=97c,11-(-53+x)=97
⇒−53+x=11−97⇒-53+x=11-97
⇒−53+x=−86⇒-53+x=-86
⇒x=−86−(−53)⇒x=-86-(-53)
⇒x=−86+53⇒x=-86+53
⇒x=−33⇒x=-33
d,−9.x+(−7).x=−48d,-9.x+(-7).x=-48
⇒[−9+(−7)].x=−48⇒[-9+(-7)].x=-48
⇒−16.x=−48⇒-16.x=-48
⇒x=−48:(−16)⇒x=-48:(-16)
⇒x=3⇒x=3
e,(2x−1)3=−27e,(2x-1)3=-27
⇒ (2x−1)3=−33⇒ (2x-1)3=-33
⇒2x−1=−3⇒2x-1=-3
⇒2x=−3+1⇒2x=-3+1
⇒2x=−2⇒2x=-2
⇒x=−2:2⇒x=-2:2
⇒x=−1
