tìm số nguyên x biết x+2x=-36
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a, (2\(x\) -5) + 17 = 6
2\(x\) - 5 = 6 - 17
2\(x\) - 5 = - 11
2\(x\) = - 11 + 5
2\(x\) = -6
\(x\) = -3
b, (-18).\(x\) = - 36
\(x\) = -36 : (-18)
\(x\) = 2
c, 15 - (-11\(x\) - 7) = -22
- 11\(x\) - 7 = 15 + 22
-11\(x\) - 7 = 37
11\(x\) = -37 - 7
11\(x\) = - 44
\(x\) = - 4
a) \(\left(2x-5\right)+17=6\Rightarrow2x-5=-11\Rightarrow2x=-6\Rightarrow x=-3\)
b) \(\left(-18\right)x=-36\Rightarrow x=\left(-36\right):\left(-18\right)=2\)
c) \(15-\left(-11x-7\right)=-22\)
\(\Rightarrow15+11x+7=-22\)
\(\Rightarrow11x=-22-7-15\)
\(\Rightarrow11x=-44\)
\(\Rightarrow x=-44:11=-4\)
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1. x + 2x = -36
=> 3x = -36
=> x = -36 : 3
=> x = -12
2. (2x + 3) \(⋮\)(x - 2)
=> (2x - 2) + 5 \(⋮\)(x - 2)
=> 2(x - 2) + 5 \(⋮\)(x - 2)
=> 5 \(⋮\)(x - 2)
=> x - 2 \(\in\)Ư(5) = {-5;-1;1;5}
=> x \(\in\){-3;1;3;7}
3. Khi đó a . (-b) = -132
4. -2(3x + 2) = 12 + 22 + 32
=> -2(3x + 2) = 1 + 4 + 9
=> -2(3x + 2) = 14
=> 3x + 2 = 14 : (-2)
=> 3x+ 2 = -7
=> 3x = -7 - 2
=> 3x = -9
=> x = -9 : 3
=> x = -3
1/ \(x+2x=-36\)
\(\Rightarrow3x=-36\)
\(\Rightarrow x=-\frac{36}{3}\)
\(\Rightarrow x=-12\)
2/ \(\left(2x+3\right)⋮\left(x-2\right)\)
\(\Leftrightarrow\left(2x-4\right)+7⋮\left(x-2\right)\)
\(\Leftrightarrow2\left(x-2\right)+7⋮\left(x-2\right)\)
\(\Rightarrow7⋮\left(x-2\right)\)
\(\Rightarrow\left(x-2\right)\inƯ\left(7\right)\)
\(\Rightarrow x\inƯ\left(7-2\right)\)
\(\Rightarrow x\inƯ\left(5\right)\)
\(\Rightarrow x\in\left\{-5,1,5\right\}\)
Vậy x nhỏ nhất để \(\left(2x-3\right)⋮\left(x-2\right)\) là -5
3/ Vì \(a\cdot b=32\)
\(\Rightarrow-a\cdot b=-\left(a\cdot b\right)=-32\)
4/ \(-2\left(3x+2\right)=1^2+2^2+3^2\)
\(\Leftrightarrow-6x-4=1+4+9\)
\(\Leftrightarrow-6x=14+4\)
\(\Leftrightarrow-6x=18\)
\(\Leftrightarrow x=\frac{18}{-6}\)
\(\Rightarrow x=3\)
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a) \(-45:5.\left(-3-2x\right)=3\)
\(-9.\left(-3-2x\right)=3\)
\(-3-2x=\left(3:-9\right)\)
\(-3-2x=\dfrac{-1}{3}\)
\(-2x=-3-\dfrac{1}{3}\)
-2x=\(\dfrac{-10}{3}\)
\(x=\dfrac{-10}{3}:-2\)
\(x=\dfrac{5}{3}\)
b)
3x - 28 = x + 36
<=> 3x - x = 36 + 28
<=> 2x = 64
<=> x = 32
Vậy x = 32
c)
(-12)2.x = 56 + 10.13.x
144.x = 56 + 130.x
144x – 130 x = 56
14x = 56
x = 56: 14
x = 4
Vậy x = 4
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a) (x: 8 - l).2 = 1.14 nên x : 8 - 1 = 7. Do đó x = 64.
b) (2x + 3).30 = 25.6 nên 2x + 3 = 5. Do đó x = 1.
c) 6.(2x - 7) = 9.(x - 3) nên 12x - 42 = 9x - 27.
Do đó 3x = 15. Vậy x = 5.
d) -7.(x + 27) = 6.(x + l) nên -7x - 189 = 6x + 6.
Do đó 13x = -195. Vậy x = -15.
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1,\(54.\left(23-11\right)+23.\left(-22-54\right)\)
\(=54.12+23.\left(-76\right)\)
\(=648-1748\)
\(=-1100\)
2,\(-7+2x=-17-\left(-36\right)\)
\(=>-7+2x=-17+36\)
\(=>-7+2x=19\)
\(=>2x=19+7=26\)
\(=>x=\frac{26}{2}=13\)
3,\(5⋮2a+3\)
\(=>2a+3\inƯ\left(5\right)\)
\(=>2a+3\in\left\{-1;-5;1;5\right\}\)
\(=>2a\in\left\{-4;-8;-2;2\right\}\)
\(=>a\in\left\{-2;-4;-1;1\right\}\)
Vậy ...
54 . ( 23 - 11 ) + 23 . ( -22 - 54 )
=54.23-54.11+23.-22-23.54
=-54.11+23.-22
=-22(27+23)
=-22.50
=-1100
-7 + 2x = -17 - ( -36 )
-7+2x=-17+36
-7+2x+17-36=0
-26+2x=0
2x=26
x=13
Vậy x=13
Để \(5⋮\left(2a+3\right)\Leftrightarrow\left(2a+3\right)\inƯ\left(5\right)\)
\(\Leftrightarrow\left(2a+3\right)\in\left\{\pm1;\pm5\right\}\)
\(\Leftrightarrow a\in\left\{-1;-2;1;-4\right\}\)
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3x=-36
x=-36:3
x=-12
ai kick mk mk kick lai
x + 2x = -36
=> 3x = -36
=> x = -36 : 3
=> x = -12
Vậy x = -12