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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
a, 117 - \(x\) = 28 - (-7)
117 - \(x\) = 28 + 7
117 - \(x\) = 35
\(x\) = 117 - 35
\(x\) = 82
b, \(x\) - (-38 - 2\(x\)) = (-3) - 8 + 2\(x\)
\(x\) + 38 + 2\(x\) = - 11 + 2\(x\)
3\(x\) + 38 = - 11 + 2\(x\)
3\(x\) - 2\(x\) = - 11 - 38
\(x\) = - 49
a ) x − 28 : − 12 = − 5 x − 28 = − 5 . − 12 x − 28 = 6 0 x = 6 0 + 28 x = 88
b ) x + 15 : − 28 = 8 x + 15 = 8 . − 28 x + 15 = − 224 x = − 224 – 15 x = − 239
c ) x + 3 0 : − 45 = − 4 x + 3 0 = − 4 . − 45 x + 3 0 = 18 0 x = 18 0 – 3 0 x = 15 0
a: =>-2x=90/91
hay x=-45/91
b: =>2x=-7
hay x=-7/2
c: ->-3x=-12
hay x=4
a) 416 + ( x-45 )= 387
416-45+x=387
x=387-(416-45)
x=16
b) 11-(x+84)=97
11-x-84=97
-x=84-11+97
-x=170
x=-170
c) -(x+84)+213=-16
-x-84+213=-16
-x=-16-213+84
-x=-145
x=145
d)x+(-35)=18
x-35=18
x=53
e) -2x-(-17)=15
-2x+17=15
-2x=-2
x=1
P/s tham khảo nha
A) 416 + (X-45) =387
416+X-45= 387
416-45+X=387
371+X=387
X=387-371
X=16
B) 11-(X+84)=97
11-X-84=97
11-84-X=97
-73-X=97
X=-73-97
X=-170
C) -(X+84) +213=-16
-X-(84-213) =-16
-X-(-129)=-16
-X=(-16)+(-129)
-X= -145
X=145
D) X+(-35)=18
X=18-(-35)
X=53
E) -2X-(-17) =15
-2X+17=15
-2X=15-17
-2X=-2
X=-2:-2
X=1
a.
\(10-2\left(4-3x\right)=-4\)
\(\Leftrightarrow2\left(4-3x\right)=10+4\)
\(\Leftrightarrow2\left(4-3x\right)=14\)
\(\Leftrightarrow4-3x=7\)
\(\Leftrightarrow3x=-3\)
\(\Leftrightarrow x=-1\)
b.
\(-12+3\left(-x+7\right)=-18\)
\(\Leftrightarrow3\left(-x+7\right)=-18+12=-6\)
\(\Leftrightarrow-x+7=-6:3=-2\)
\(\Leftrightarrow x=9\)
c.
\(-45:5.\left(-3-2x\right)=3\)
\(\Leftrightarrow-9.\left(-3-2x\right)=3\)
\(\Leftrightarrow-3-2x=-\dfrac{1}{3}\)
\(\Leftrightarrow2x=-\dfrac{8}{3}\)
\(\Leftrightarrow x=-\dfrac{4}{3}\notin Z\left(loại\right)\)
Câu này em ghi sai đề?
d.
\(3x-28=x+36\)
\(\Leftrightarrow2x=28+36\)
\(\Leftrightarrow2x=64\)
\(\Leftrightarrow x=32\)
e.
\(\left(-12\right)^2.x=56+10.13x\)
\(\Leftrightarrow144x=56+130x\)
\(\Leftrightarrow144x-130x=56\)
\(\Leftrightarrow14x=56\)
\(\Leftrightarrow x=4\)
a) x = 0
b) x= 0
c) x = -16
d) x = 15
e) x : 2 +1 = 8 hoặc x:2+1 = -8 . Do đó x = 14 hoặc x = -18.
f) x: 2 = 11 hoặc x : 2 = -11 . Do đó x = 22 hoặc x = -2
a)
\(-5+2x=-45\Leftrightarrow2x=-45+5\Leftrightarrow2x=-40\Leftrightarrow x=-20\)
\(-\dfrac{x}{4}=\dfrac{28}{16}\Leftrightarrow-\dfrac{4x}{16}=\dfrac{28}{16}\Leftrightarrow-4x=28\Rightarrow x=-\dfrac{28}{4}=-7\)