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x/4=18/x+1
=) x × (x+1) = 4×18
=) x × (x+1) = 72
=) x; x+1 thuộc ước của 72
Mà x+1 - x=1
=) Ta có 2 trường hợp,:
TH1: x=7
x+1=8=)x=7
TH2: x=-8
x+1=-7=) x=-8
Vậy x =-8 ; 7
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a) x= 1/4
b) x= -7/144
c) x= 25/6
d) x=17/7
e) x= 80/63
f) x= -45/14
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1) 20-(x+2)=8
\(x+2=20-8\)
\(x+2=12\)
\(x=12-2\)
\(x=10\)
2) (x-4)-6=18
\(x-4=18+6\)
\(x-4=24\)
\(x=24+4\)
\(x=28\)
1) \(20-\left(x+2\right)=8\)
<=>\(x+2=20-8\)
<=>\(x+2=12\)
<=>\(x=12-2\)
<=>\(x=10\)
vậy x=10
2) \(\left(x-4\right)-6=18\)
<=>\(x-4=18-6\)
<=>\(x-4=12\)
<=>\(x=12+4\)
<=>\(x=16\)
vậy x = 16
\(\)
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a) Ta có: \(\left(x-\frac{1}{3}\right)^2-\frac{1}{4}=0\)
\(\Rightarrow\left(x-\frac{1}{2}\right)^2=\frac{1}{4}\)
\(\Rightarrow x-\frac{1}{2}=\frac{1}{2}\Rightarrow x=1\)
hoặc \(x-\frac{1}{2}=-\frac{1}{2}\Rightarrow x=-\frac{1}{2}+\frac{1}{2}=0\)
Vậy \(x\in\left\{1;0\right\}\)
b)\(20\%.x+\frac{2}{5}x=x-4\)
\(\Rightarrow\frac{1}{5}x+\frac{2}{5}x-x=-4\)
\(\Rightarrow\frac{-2}{5}x=-4\)
\(\Rightarrow x=-4:\left(-\frac{2}{5}\right)=10\)
Vậy x=10
c) 3(x+1)+4(x+3)-2(x+16) = 18
=> 3x+3+4x+12-2x-32 =18
=> (3x+4x-2x)+(3+12-32)=18
=> 5x - 17 = 18
=> 5x = 18 + 17 = 35
=> x = 35 : 5 = 7
Vậy x = 7
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a) 16x<1284
nên (24)x<(27)4
24x<228
vậy x thuộc 1, 2, 3, 4, 5, 6
b)chứng minh tương tự
chú ý 100...0(18 chữ số 0) là 1018
Kết quả 53x+3<=518
hay 3x+3<18
vậy x thuộc 1, 2, 3, 4
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1) (2 4/5+3 1/2).x =18/17
(14/5 + 7/2).x = 18/17
(28/10 + 35/10). x = 18/17
63/10.x = 18/17
x = 18/17 : 63/10
x =...(cái này bạn tự tính nhé :v )
2) Làm tương tự như phần 1
\(6\frac{1}{3}x-5\frac{1}{3}x=\frac{1}{7}\)
\(\Leftrightarrow\frac{19}{3}x-\frac{16}{3}x=\frac{1}{7}\)
\(\Leftrightarrow\frac{3}{3}x=\frac{1}{7}\)
\(\Leftrightarrow x=\frac{1}{7}\)
Vậy \(x=\frac{1}{7}\)
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a) | x + 1 | = 3 và x + 1 < 0
Vì (x+1)<0 nên suy ra x+1=3
<=>x=2
Vậy x=2
b) x + | - 2 | = 0
<=>x+2=0
<=>x=-2
Vậy x=-2
c) 4 . ( 3x - 4 ) - 2 = 18
<=>12x-16-2=18
<=>12x-18=18
<=>12x=36
<=>x=3
Vậy x=3
a, | x + 1 | = 3
\(\Rightarrow\hept{\begin{cases}x+1=3\\x+1=-3\end{cases}\Rightarrow\hept{\begin{cases}x=3-1\\x=-3-1\end{cases}\Rightarrow}\hept{\begin{cases}x=2\\x=-4\end{cases}}}\)
b, x + | - 2 | = 0
x + 2 = 0
x = 0 - 2
x = -2
c, 4 . ( 3x -4 ) - 2 = 18
4 . ( 3x - 4 ) = 18 + 2
4 . ( 3x - 4 ) = 20
3x - 4 = 5
3x = 5 - 4
3x = 1
x =\(\frac{1}{3}\)
\(4 \times x+18:2=1\)
\(4 \times x+9=1\)
\(4 \times x=-8\)
\(x=-8:4=-2\)
-2