3x - 82 = 2-x
305 + x + 14 = 48 - ( x - 23)
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1, ( - 12 ) - ( 13 - x ) = - 15 - ( - 17 )
=> - 12 - 13 + x = - 15 + 17
=> - 25 + x = 2
=> x = 2 + 25
=> x = 27
2, 305 - x + 14 = 48 + ( x - 23 )
=> 305 - x + 14 = 48 + x - 23
=> x + x = 305 + 14 - 48 + 23
=> 2x = 294
=> x = 147
3, - ( x - 6 + 85 ) = ( x + 51 ) - 54
=> - x + 6 - 85 = x + 51 - 54
=> x + x = 6 - 85 - 51 + 54
=> 2x = - 76
=> x = - 38
4, - ( 35 - x ) - ( 37 - x ) = 33 - x
=> - 35 + x - 37 + x = 33 - x
=> x + x + x = 33 + 35 + 37
=> 3x = 105
=> x = 35
a) \(-x-14+32=-26\)
\(-x=-26-32+14\)
\(-x=-44\)
\(x=44\)
b) \(-152-\left(3x+1\right)=\left(-2\right)\left(-27\right)\)
\(-152-3x-1=54\)
\(-3x=96\)
\(x=-32\)
c) \(x+x+x+82=-2-x\)
\(3x+82=2+x\)
\(2x=-80\)
\(x=-40\)
d) \(\left(-1\right)\left(-3\right)\left(-6\right)x=36\)
\(-18x=36\)
\(x=-2\)
1)
\(-x-14+32=-26\)
\(\Rightarrow-x+18=-26\)
\(\Rightarrow-x=-26-18\)
\(\Rightarrow-x=-44\)
\(\Rightarrow x=44\)
Vậy \(x=44\)
2)
\(-152-\left(3x+1\right)=\left(-2\right)\left(-27\right)\)
\(\Rightarrow-152-3x-1=54\)
\(\Rightarrow-153-3x=54\)
\(\Rightarrow-3x=54+163\)
\(\Rightarrow-3x=207\)
\(\Rightarrow x=207:\left(-3\right)\)
\(\Rightarrow x=-69\)
Vậy \(x=-69\)
3)
\(x+x+x+82=-2-x\)
\(\Rightarrow3x+82=-2-x\)
\(\Rightarrow3x+x=-2-82\)
\(\Rightarrow4x=-84\)
\(\Rightarrow x=-21\)
Vậy \(x=-21\)
4)
\(\left(-1\right)\left(-3\right)\left(-6\right).x=36\)
\(\Rightarrow-18x=36\)
\(\Rightarrow x=-2\)
Vậy \(x=-2\)
Bài 2:
a: =>x-45=-20
hay x=25
b: =>35+30-5x=-12+112
=>65-5x=100
=>5x=-35
hay x=-7
c: =>x-124=1000
hay x=1124
d: \(\Leftrightarrow46-\left(3x-2\right)^3=-18\)
\(\Leftrightarrow\left(3x-2\right)^3=64\)
=>3x-2=4
hay x=2
Bài 2:
a: =>x-45=-20
hay x=25
b: =>35+30-5x=-12+112=100
=>65-5x=100
=>5x=-35
hay x=-7
c: =>x-124=1000
hay x=1124
d: \(\Leftrightarrow46-\left(3x-2\right)^3=-18\)
\(\Leftrightarrow\left(3x-2\right)^3=64\)
=>3x-2=4
hay x=2
TL:
23 x 14 + 23 x 16 + 20 x 23 + 50 x 23
= 23 x ( 14 + 16 + 20 + 50 )
= 23 x 100
= 2300
- HT -
Ta có 23 x 14 + 23 x 16 + 20 x 23 + 50 x 23 = 23 x (14 + 16 + 20 + 50 ) = 23 x 100 = 2300
Bài 8:
\(F=x^2-2x+1+x^2-6x+9=2x^2-8x+10\\ F=2\left(x^2-4x+4\right)+2=2\left(x-2\right)^2+2\ge2\\ F_{min}=2\Leftrightarrow x=2\)
Bài 9:
\(A=-x^2+2x-1+5=-\left(x-1\right)^2+5\le5\\ A_{max}=5\Leftrightarrow x=1\\ B=-x^2+10x-25+2=-\left(x-5\right)^2+2\le2\\ B_{max}=2\Leftrightarrow x=5\\ C=-x^2+6x-9+9=-\left(x-3\right)^2+9\le9\\ C_{max}=9\Leftrightarrow x=3\)
3x - 82 = 2-x
=> 3x+x = 2+82
=> 4x = 84
=> x = 84 : 4
=> x = 21
vậy_____
305 + x + 14 = 48 - ( x - 23)
=> 319 + x = 48 - x + 23
=> 319 + x = 71 - x
=> x+x = 71 - 319
=> 2x = -248
=> x = -248 : 2
=> x = -124
vậy____
3x - 82 = 2 - x
<=> 3x + x = 2 + 82
<=> 4x = 84
<=> x = \(\frac{84}{4}\)= 21