27 - |x + 4| = 13
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Có:4-(27-3)=x-(13-4)
=>x-(13-4)=4-(27-3)
x-9=4-24
x-9=-20
x=-20+9
x=-11
Vậy x=-11
Đúng đấy,TICK nha!^^
l - x - 3 l + ( - l 49 l ) = 27
l - x - 3 l + ( - 49 ) = 27
l - x - 3 l = 27 - ( - 49 )
l - x - 3 l = 76
=> \(\orbr{\begin{cases}-x-3=76\\-x-3=-76\end{cases}}\)=> \(\orbr{\begin{cases}-x=76+3\\-x=-76+3\end{cases}}\)=> \(\orbr{\begin{cases}-x=79\\-x=-73\end{cases}}\)=> \(\orbr{\begin{cases}x=-79\\x=73\end{cases}}\)
Vậy x thuộc { - 79 ; 73 }
| -x - 3| + |49| = 27
=> -x - 3 + 49 = 27 hoặc -x - 3 + 49 = -27
-x - 3 = 27 - 49 -x - 3 = (-27) - 49
-x - 3 = -22 -x - 3 = -76
-x = (-22) + (-3) -x = (-76) + (-3)
-x = -25 -x -79
Vậy -x = -25; -x = -79
4 -(27 - 3) = x -(13 - 4)
4 - 24 = x - 9
x - 9 = -20
x= -20 + 9 = -11
4-(27-3)=x-(913-4)
4-27+3=x-913+4
-20 =x-913+4
-20+913-4=x
889 =x
=>x=889
Ta có :
\(\frac{x-3}{97}+\frac{x-27}{73}+\frac{x-67}{33}+\frac{x-73}{27}=4\)
\(\Leftrightarrow\left(\frac{x-3}{97}-1\right)+\left(\frac{x-27}{73}-1\right)+\left(\frac{x-67}{33}-1\right)+\left(\frac{x-73}{27}-1\right)=0\)
\(\Leftrightarrow\frac{x-100}{97}+\frac{x-100}{73}+\frac{x-100}{33}+\frac{x-100}{27}=0\)
\(\Leftrightarrow\left(x-100\right)\left(\frac{1}{97}+\frac{1}{73}+\frac{1}{33}+\frac{1}{27}\right)=0\)
Vì \(\frac{1}{97}+\frac{1}{73}+\frac{1}{33}+\frac{1}{27}>0\) Nên \(x-100=0\)
\(\Leftrightarrow x=100\)
Vậy \(x=100\)
\(\Leftrightarrow\frac{x-3}{87}+\frac{x-27}{79}+\frac{x-67}{33}+\frac{x-73}{27}-4=0\)
\(\Leftrightarrow\left(\frac{x-3}{97}-1\right)+\left(\frac{x-27}{73}-1\right)+\left(\frac{x-67}{33}-1\right)+\left(\frac{x-73}{27}-1\right)=0\)
\(\Leftrightarrow\left(\frac{x-3-97}{97}\right)+\left(\frac{x-27-73}{73}\right)+\left(\frac{x-67-33}{33}\right)+\left(\frac{x-73-27}{27}\right)=0\)
\(\Leftrightarrow\frac{x-100}{97}+\frac{x-100}{73}+\frac{x-100}{33}+\frac{x-100}{27}=0\)
\(\Leftrightarrow\left(x-100\right)\left(\frac{1}{97}+\frac{1}{73}+\frac{1}{33}+\frac{1}{27}\right)=0\)
Vì \(\frac{1}{97}+\frac{1}{73}+\frac{1}{33}+\frac{1}{27}\ne0\)
\(\Rightarrow x-100=0\Leftrightarrow x=100\)
2x - 3 = 7 3 . ( x + 7 ) = 15 24 . 3 . ( 5 - x ) = 27 15 + 4 . ( x - 2 ) = 95
2x = 3 + 7 x + 7 = 15 : 3 3 . ( 5 - x ) = 27 : 24 4 . ( x - 2 ) = 95 - 15
2x = 10 x + 7 = 5 3 . ( 5 - x ) = 1,125 4 . ( x - 2 ) = 80
x = 10 : 2 x = 5 - 7 5 - x = 1,125 : 3 x - 2 = 80 : 4
x = 5 x = ( -2 ) 5 - x = 0,375 x - 2 = 20
x = 5 - 0,375 x = 20 + 2
x = 4,625 x = 22
27 - |x + 4| = 13
<=> |x + 4| = 14
<=> x + 4 = 14 hoặc x + 4 = -14
<=> x = 10 hoặc x = -18
Vậy ..........
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