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x + 12 =(-5)-x
x + x = -5 - 12
2x = -17
\(x=-\frac{17}{2}\)
x + 5 = 10 - x
x + x = 10 - 5
2x = 5
\(x=\frac{5}{2}\)
12-x=x+1
12 - 1 = x+x
11=2x
x=\(\frac{11}{2}\)
14+4x=3x-20
4x-3x=-20-14
x=-34
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1) 3x - 6= 5x + 2
5x - 3x = -6 - 2
2x = -8
x = -4
2) 15 - x = 4x - 5
4x + x = 15 + 5
5x = 20
x = 4
Tương tự như trên
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1) \(\Leftrightarrow x+11-15+x+20=0\)
\(\Leftrightarrow2x+16=0\)
\(\Leftrightarrow x=-8\)
2) \(\Leftrightarrow2x-16+x-13=16\)
\(\Leftrightarrow3x-45=0\)
\(\Leftrightarrow x=15\)
Những câu dưới bạn làm tương tự như vậy nhé
1)(x+11)–(15–x) =–20
x+11 - 15 + x = -20
x + ( 11 -15 ) = -20
x + ( -4 ) = -20
x = -20 - ( -4 )
x = -16
tìm x,biết
5-x-16=40+x
4x-10=15-x
15-x=4x-5
x-15=6+4x
-12+x=5x-20
7x-4=20+3x
5x-7=-21-2x
x+15=20-4x
17-x=7-6x
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\(\text{1,(-14)+(2x–4^2)=/-10/×/5/}\)
\(-14-16+2x=10.5\)
\(-30+2x=50\)
\(2x=50--30\)
\(2x=80\)
\(x=80:2\)
\(x=40\)
\(\text{2,(-100)–/x+20/=-150}\)
\(|x+20|=-100--150\)
\(|x+20|=50\)
\(\Rightarrow\orbr{\begin{cases}x+20=50\\x+20=-50\end{cases}\Leftrightarrow\orbr{\begin{cases}x=30\\x=-70\end{cases}}}\)
\(\Rightarrow x\in\left\{-70;30\right\}\)
\(\text{3)3x+16=4x–61}\)
\(3x-4x=-61-16\)
\(-x=-77\)
\(\Rightarrow x=77\)
\(\text{4,2(x–5)–3(x+6)=0}\)
\(2x-10-3x-18=0\)
\(2x-3x=0+18+10\)
\(-x=28\)
\(x=-28\)
chúc bạn học tốt
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5.
$4x+3\vdots x-2$
$\Rightarrow 4(x-2)+11\vdots x-2$
$\Rightarrow 11\vdots x-2$
$\Rightarrow x-2\in \left\{1; -1; 11; -11\right\}$
$\Rightarrow x\in \left\{3; 1; 13; -9\right\}$
6.
$3x+9\vdots x+2$
$\Rightarrow 3(x+2)+3\vdots x+2$
$\Rightarrow 3\vdots x+2$
$\Rightarrow x+2\in \left\{1; -1; 3; -3\right\}$
$\Rightarrow x\in \left\{-1; -3; 1; -5\right\}$
7.
$3x+16\vdots x+1$
$\Rightarrow 3(x+1)+13\vdots x+1$
$\Rightarrow 13\vdots x+1$
$\Rightarrow x+1\in \left\{1; -1; 13; -13\right\}$
$\Rightarrow x\in\left\{0; -2; 12; -14\right\}$
8.
$4x+69\vdots x+5$
$\Rightarrow 4(x+5)+49\vdots x+5$
$\Rightarrow 49\vdots x+5$
$\Rightarrow x+5\in\left\{1; -1; 7; -7; 49; -49\right\}$
$\Rightarrow x\in \left\{-4; -6; 2; -12; 44; -54\right\}$
** Bổ sung điều kiện $x$ là số nguyên.
1. $x+9\vdots x+7$
$\Rightarrow (x+7)+2\vdots x+7$
$\Rightarrow 2\vdots x+7$
$\Rightarrow x+7\in \left\{1; -1; 2; -2\right\}$
$\Rightarrow x\in \left\{-6; -8; -5; -9\right\}$
2. Làm tương tự câu 1
$\Rightarrow 9\vdots x+1$
3. Làm tương tự câu 1
$\Rightarrow 17\vdots x+2$
4. Làm tương tự câu 1
$\Rightarrow 18\vdots x+2$
4(x - 10) - (-3x + 4) = -2(x + 5) - (-4x +20)
=> 4x - 40 + 3x - 4 = -2x - 10 + 4x - 20
=> 7x - 44 = 2x - 30
=> 7x - 2x = -30 + 44
=> 5x = 14
=> x = 14 : 5
=> x = 14/5
\(4\left(x-10\right)-\left(-3x+4\right)=-2\left(x+5\right)-\left(-4x+20\right)\)
\(\Rightarrow4x-40+3x-4=-2x-10+4x-20\)
\(\Rightarrow4x+3x+2x-4x=-10-20+4+40\)
\(\Rightarrow5x=14\Rightarrow x=\frac{14}{5}\)