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1722:{5740:[1470-(125+75.x)]}-114=13
2193:{[(2223-18x):135-7]+123}+1989=2006
{[(2x+14):2^2-3]:2}+19=20
123 x 45 - 41 x 135=
=123 x 45 - 41 x 3 x 45
=123 x 45 - 123 x 45
=0
123 x 45 - 41 x 135
= 123 x 45 - 41 x 3 x 45
= 45 x ( 123 - 41 x 3)
= 45 x ( 123 - 123)
=0
a: \(\Leftrightarrow x^2-x+4x-4+5⋮x-1\)
\(\Leftrightarrow x-1\in\left\{1;-1;5;-5\right\}\)
hay \(x\in\left\{2;0;6;-4\right\}\)
c: \(\Leftrightarrow4x-5=13k\left(k\in Z\right)\)
=>4k=13k+5
hay \(x=\dfrac{13k+5}{4}\)
\(x^{2016}=x^{2017}\\ \Leftrightarrow x^{2016}-x^{2017}=0\\ \Leftrightarrow x^{2016}\left(1-x\right)=0\\ \Leftrightarrow\left[{}\begin{matrix}x^{2016}=0\\1-x=0\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=0\\x=1\end{matrix}\right.\)
Vậy S = {0;1}
135 - ( 2 - x ) = ( x - 934 ) - 16
\(\Leftrightarrow\) 135 - 2 + x = x - 934 - 16
\(\Leftrightarrow\) 135 - 2 + x = x - 950
\(\Leftrightarrow\) 0x = 950 - 135 + 2
\(\Leftrightarrow\) 0x = 717
\(\Leftrightarrow\) x \(\in\varnothing\)
135 - (2 - x) = ( x - 934) - 16
=> 135 - 2 + x = x - 934 - 16
=> 133 + x = x - 920
=> 133 + 920 = 2x
=> 1053 = 2x
=> x = 1053 / 2
135-(2-x)=(x-934)-16
(x-934)-(2-x)=135-16=119
2x-934-2=119
2x-932=119
2x=119+932
2x=1051
x=1051:2
x=525,5
2193: {[( 2223 - 18x): 135] + 123} + 1996 = 2013
____ _______________________ = 2013 - 1996 = 17
[( 2223 - 18x) : 135] +123 = 2193: 17 = 129
(2223 - 18x) : 135 = 129 - 123 = 3
2223 - 18x = 135.3 = 405
18x = 2223 - 405 = 1818
x = 1818: 18 = 101
Vậy x = 101
tíc nha!