2/1/3.x + 12/5 = 96 +1/2
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2/3x - 3/2x = 5/12
=> ( 2/3 - 3/2 )x = 5/12
=> -5/6x = 5/12
=> x = 5/12 : -5/6
=> x = -1/2
( x + 1/2 ) . ( 2/3 - 2x ) = 0
=> x + 1/2 = 0 hoặc 2/3 - 2x = 0
=> x = -1/2 hoặc x = 1/3
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a ) \(15:\left(x+2\right)=3\)
\(\left(x+2\right)=15:3\)
\(x+2=5\)
\(x=5-2\)
\(x=3\)
Vậy \(x=3\)
b) \(20:\left(1+x\right)=2\)
\(\left(1+x\right)=20:2\)
\(1+x=10\)
\(x=10-1\)
\(x=9\)
Vậy \(x=9\)
c) \(240:\left(x-5\right)=2^2.5^2=20\)
\(240:\left(x-5\right)=4.25=20\)
\(240:\left(x-5\right)=100=20\)
\(\Rightarrow\orbr{\begin{cases}240:\left(x-5\right)=100\\240:\left(x-5\right)=20\end{cases}}\)
\(\Rightarrow\orbr{\begin{cases}\left(x-5\right)=240:100\\\left(x-5\right)=240:20\end{cases}}\)
\(\Rightarrow\orbr{\begin{cases}x-5=2,4\\x-5=12\end{cases}}\)
\(\Rightarrow\orbr{\begin{cases}x=2,4+5\\x=12+5\end{cases}}\)
\(\Rightarrow\orbr{\begin{cases}x=7,4\\x=17\end{cases}}\)
Vậy \(x=7,4\)hoặc \(x=17\)
d) \(96-3\left(x+1\right)=12\)
\(3\left(x+1\right)=96-12\)
\(3\left(x+1\right)=84\)
\(\left(x+1\right)=84:3\)
\(x+1=28\)
\(x=28-1\)
\(x=27\)
Vậy \(x=27\)
Chúc bạn học tốt !!!
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1: =>5(2x+6)=40
=>2x+6=8
=>2x=2
=>x=1
2: =>12-(x+3)=256:64=4
=>(x+3)=8
=>x=5
3: =>2x-1=3 hoặc 2x-1=-3
=>x=2 hoặc x=-1
4: \(\Leftrightarrow3^{x+2017}=3^{2015}\)
=>x+2017=2015
=>x=-2
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\(3.\left(x-2\right)+99=144\)
\(=>3.\left(x-2\right)=144-99\)
\(=>3.\left(x-2\right)=45\)
\(=>x-2=45:3\)
\(=>x-2=15\)
\(=>x=17\)
vậy \(x=17\)
b) \(5.\left(x-12\right)=40\)
\(=>x-12=40:5\)
\(=>x-12=8\)
\(=>x=20\)
vậy \(x=20\)
c) \(16+4.\left(x-1\right)=96\)
\(=>4.\left(x-1\right)=96-16\)
\(=>4.\left(x-1\right)=80\)
\(=>x-1=80:4\)
\(=>x-1=20\)
\(=>x=21\)
vậy \(x=21\)
k mình nha vì mình đang âm điểm
chúc pạn học giỏi
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Bài này có cần phải tính nhanh ko vậy bn?
Nếu ko thì lấy máy tính mà tính cũng đc mà
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b: \(\Leftrightarrow9x^2+12x+4-18x+12=9x^2\)
=>-6x+16=0
=>-6x=-16
hay x=8/3(nhận)
c: \(\Leftrightarrow\dfrac{x+1+x-1}{\left(x-1\right)\left(x+1\right)}=\dfrac{2}{x+2}\)
\(\Leftrightarrow2x\left(x+2\right)=2\left(x^2-1\right)\)
\(\Leftrightarrow2x^2+4x-2x^2+2=0\)
=>4x+2=0
hay x=-1/2(nhận)
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12 . (x - 1) : 3 = 43 + 23
12 . (x - 1) : 3 = 72
12 . (x - 1) = 72 . 3
12 . (x - 1) = 216
(x - 1) = 216 : 12
x - 1 = 18
x = 18 + 1
x = 19
12.(x-1):3=43+23
12.(x-1):3=64+8
12.(x-1)=72
x-1=72:12
x-1=6
x=6+1
x=7
vậy x=7
2x+2-x=96
2x.22-x=96
2x.4-x=96
2x-x=96:4
2x-x=24
ai đổi k ko