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-7-2x = 37-(-26)
Suy ra -7-2x=11
Suy ra -2x=11-7
Suy ra -2x=4
Suy ra 2x= -4
Suy ra x = -4 :2 =-2
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a ) 4x - 26 = 18
\(\Rightarrow\)4x = 44
\(\Rightarrow\)x = 11
Vậy : x = 11 .
b ) 17 - 2x = - 21
\(\Rightarrow\)2x = 38
\(\Rightarrow\)x = 19
Vậy : x = 19 .
c ) | 2x + 1 | = 5
\(\Rightarrow\)2x + 1 = 5 hoặc 2x + 1 = - 5
\(\Rightarrow\)x = 2 hoặc x = - 3
Vậy : x = 2 hoặc x = - 3 .
d ) ( x + 1)( x - 3 ) = 0
\(\Rightarrow\)x + 1 = 0 hoặc x - 3 = 0
\(\Rightarrow\)x = - 1 hoặc x = 3
Vậy : x = - 1 hoặc x = 3 .
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Lời giải:
a.
$4(2x-4)+2=18$
$4(2x-4)=16$
$2x-4=16:4=4$
$2x=4+4=8$
$x=8:2$
$x=4$
b.
\(5^3+(18x-65).3=26^2+10\)
$125+3(18x-65)=686$
$3(18x-65)=686-125=561$
$18x-65=561:3=187$
$18x=187+65$
$18x=252$
$x=252:18=14$
c.
\(|x-10|+2^2.5=5^5\)
$|x-10|+20=3125$
$|x-10|=3125-20=3105$
$\Rightarrow x-10=3105$ hoặc $x-10=-3105$
$\Rightarrow x=3115$ hoặc $x=-3095$
d.
\((x-2)^2-2^3.5=104\)
$(x-2)^2-40=104$
$(x-2)^2=104+40=144=12^2=(-12)^2$
$\Rightarrow x-2=12$ hoặc $x-2=-12$
$\Rightarrow x=14$ hoặc $x=-10$
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\(\left|x-2017\right|=2016\)
\(\Rightarrow\left[\begin{matrix}x-2017=-2016\\x-2017=2016\end{matrix}\right.\)
\(\Rightarrow\left[\begin{matrix}x=1\\x=4033\end{matrix}\right.\)
Vậy x= 1 hoặc x= 4033
\(3x-20=-8\)
\(\Rightarrow3x=12\Rightarrow x=\frac{12}{3}=4\)
\(26-2x=18+\left|-14\right|\)
\(\Rightarrow26-2x=32\)
\(\Rightarrow2x=26-32\)
\(\Rightarrow2x=-6\)
\(\Rightarrow x=-3\)
![](https://rs.olm.vn/images/avt/0.png?1311)
B3 a) x=4 b) x=-7 c) x=5 d) x=4
B2 a) -3+ -2+ -1+0+1+2+3+4=4
b) -6+ -5+ -4+ -3+ -2+ -1+0+1+2+3+4=-11
c) -18+-17+-16+-15+-14+-13+-12+-11+-10+-9+-8+-7+-6+-5+-4+3+-2+-1+0+1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19=19
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a) \(\left(2x-6\right)\left(3x-18\right)=0\)
\(\Leftrightarrow\orbr{\begin{cases}2x-6=0\\3x-18=0\end{cases}}\Leftrightarrow\orbr{\begin{cases}x=3\\x=6\end{cases}}\)
b) \(5x+73.21=73.26\)
\(\Leftrightarrow5x=73.5\)
\(\Rightarrow x=73\)
c) \(2x-12-x=0\)
\(\Rightarrow x=12\)
3.(2x-26)=18
2x-26=18:3
2x-26= 6
2x = 6 +26
2x = 32
2x = 25
=>x = 5