(4x-2008):4-48=48
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(4x-2008):4-48=48
(4x-2008):4=48+48
(4x-2008):4=96
4x-2008 =96.4
4x-2008 =384
4x =384+2008
4x =2392
x =2392:4
x =598
Vậy x = 598
\(\left(4x-2008\right):4-48=48\)
\(\Rightarrow\left(4x-2008\right):4=48+48\)
\(\Rightarrow\left(4x-2008\right):4=96\)
\(\Rightarrow\left(4x-2008\right)=96.4\)
\(\Rightarrow\left(4x-2008\right)=384\)
\(\Rightarrow4x=384+2008\)
\(\Rightarrow4x=2392\)
\(\Rightarrow x=2396:4\)
\(\Rightarrow x=598\)
\(=(4x^2+16x-20x-80+32):(x+4)\\ =[4x(x+4)-20(x+4)+32]:(x+4)\\ =4x-20(\text{dư }32)\)
3457 - 27 x 48 - 48 x 73 + 6543
=3457 - 48 x ( 27 + 73) + 6543
=3457 - 48 x 100 + 6543
=(3457+ 6543) - 4800
=10000- 4800
=5200
`a)sqrt{1-4x+4x^2}+5=x-2`
`<=>\sqrt{(2x-1)^2}=x-2-5`
`<=>|2x-1|=x-7(x>=7)`
`<=>[(2x-1=x-7),(2x-1=7-x):}`
`<=>[(x=-6(ktm)),(3x=8):}`
`<=>x=8/3(ktm)`
Vậy PTVN
`b)3sqrt{12+4x}+4/7sqrt{147+49x}=3/2sqrt{48+16x}+4(x>=-3)`
`<=>6sqrt{x+3}+4sqrt{x+3}=6sqrt{x+3}+4`
`<=>4sqrt{x+3}=4`
`<=>sqrt{x+3}=1<=>x+3=1`
`<=>x=-2(tm)`
Vậy `S={-2}`
a) \(\sqrt{1-4x+4x^2}+5=x-2\Leftrightarrow\sqrt{\left(1-2x\right)^2}+5=x-2\Leftrightarrow\left|1-2x\right|=x-7\left(1\right)\)TH1: \(1-2x\ge0\Leftrightarrow x\le\dfrac{1}{2}\)
\(\left(1\right)\Leftrightarrow1-2x=x-7\Leftrightarrow3x=8\Leftrightarrow x=\dfrac{8}{3}\)(không thỏa đk)
TH2: \(1-2x< 0\Leftrightarrow x>\dfrac{1}{2}\)
\(\left(1\right)\Leftrightarrow2x-1=x-7\Leftrightarrow x=-6\)(không thỏa đk)
Vậy \(S=\varnothing\)
b) \(3\sqrt{12+4x}+\dfrac{4}{7}\sqrt{147+49x}=\dfrac{3}{2}\sqrt{48+16x}+4\Leftrightarrow6\sqrt{3+x}+4\sqrt{3+x}=6\sqrt{3+x}+4\Leftrightarrow4\sqrt{3+x}=4\Leftrightarrow\sqrt{3+x}=1\Leftrightarrow3+x=1\Leftrightarrow x=-2\)
(4x - 2008 ) : 4 - 48 = 48
( 4x - 2008 ) : 4 = 48 +48
(4x - 2008 ) : 4 = 96
4x - 2008 = 96.4
4x - 2008 = 384
4x = 384 + 2008
4x = 2382
x = 598
Tk mk nha
(4x-2008):4 = 96
4x-2008 = 384
4x = 2392
x = 598
k nhé