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\(\Leftrightarrow\)2x+234=2012-2012+15x
\(\Leftrightarrow\)2x-15x=-234
\(\Leftrightarrow\)-13x=-234
\(\Leftrightarrow\)x=18
234-4x(2x+17)=118
4x(2x+17)=234-118
4x(2x+17)=116
(2x+17)=116:4
(2x+17)=29
2x =29-17
2x =12
x =12:2
x = 6
234 - 4 . ( 2x + 17 ) = 188
4 . ( 2x + 17 ) = 234 - 188
4 . ( 2x + 17 ) = 116
( 2x + 17 ) = 116 : 4
( 2x + 17 ) = 29
2x = 29 - 17
2x = 12
x = 12 : 2
x = 6
12 - ( x - 11 ) = ( -9 )
12 - x + 11 = -9
-x = -32
x = 32
a) \(x-\left(-234\right)=766\)
\(x=766+\left(-234\right)\)
\(x=532\)
b) \(2017-\left(17-x\right)=4016\)
\(17-x=2017-4016\)
\(17-x=\left(-1999\right)\)
\(x=17-\left(-1999\right)\)
\(x=2016\)
c) \(\left|x-1\right|=5\)
\(\left|x\right|=5+1\)
\(\left|x\right|=6\)
\(\Rightarrow x=6\)
d) \(\left(2x+1\right)^2=9\)
\(x=1\)
a)-(2x + 15 ) + 13 = -234
\(\Leftrightarrow\)-2x-15+13+234=0
\(\Leftrightarrow\)2x=232
\(\Leftrightarrow\)x=116
b)2+4+6+8 +..............+2x=182
\(\Leftrightarrow\)2(1+2+3+4+.....+x) =182
\(\Leftrightarrow\)1+2+3+4+.....+x= 182/2 = 91
\(\Leftrightarrow\)x(x+1)/2 =91
\(\Leftrightarrow\)x(x+1)= 182
\(\Leftrightarrow\)x(x+1) = 13(13+1)
\(\Leftrightarrow\)\(\hept{\begin{cases}x=13\\x+1=13+1\end{cases}}\Leftrightarrow x=13\)
Vậy...
234 ( 2x - 9 ) = 234
2x - 9 = 1
2x = 10
x = 5
234 x ( 2 x X - 9 ) = 234
( 2 x X - 9 ) = 234 : 234
( 2 x X - 9 ) = 1
2 x X = 1 + 9
2 x X = 10
X = 10 : 2
X = 5
Tk nha!