Tìm x :
234 - 4 . (2x+17)=118
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( x - 1 ) + 5 = 17
x - 1 = 17 - 5
x - 1 = 12
x = 12 + 1
x = 13
a) x + 118 = 218
x = 218 – 118
x = 100
b) 18 – x = -17
X = 18 – (-17)
X = 35
c) (-18) – x = -17
X = (-18) – (-17)
X = -1
d)124 + (118 – x) = 217
118 – x = 93
X = 118 – 93
X = 25
e) (3x – 6).3 = 34
(3x – 6).3 = 81
3x – 6 = 27
3x = 33
ð X = 11
g) 23.(42 – x) = 46
42 – x = 2
ð X = 40
h) 84 – (3x + 8) = 34
3x + 8 = 84 – 34
3x + 8 = 50
3x = 50 – 8
3x = 42
X = 42 : 3
ð X = 14
i) 3.(2x + 1) – 19 = 14
3.(2x + 1) = 14 + 19
3.(2x + 1) = 33
2x + 1 = 33 : 3
2x + 1 = 11
2x = 11 – 1
2x = 10
X = 10 : 2
ð X = 5
k) 6x – 302 = 23.5
6x – 302 = 40
6x = 40 + 302
6x = 342
X = 342 : 6
ð X = 57
m) (x – 1)2 = 81
(x – 1)2 = 92
ð X – 1 = 9
ð X = 9 + 1
ð X = 10
n) 2x+1 – 5 = 27
2x+1 = 27 + 5
2x+1 = 32
2x+1 = 25
ð X = 4
\(2x-35=15\)
\(\Rightarrow2x=15+35\)
\(\Rightarrow2x=50\)
\(\Rightarrow x=\frac{50}{2}=25\)
Vậy : \(x=25\)
\(3x+17=2\)
\(\Rightarrow3x=2-17\)
\(\Rightarrow3x=-15\)
\(\Rightarrow x=-\frac{15}{3}=-5\)
Vậy: \(x=-5\)
\(\left|x-1\right|=0\)
\(\Rightarrow x-1=0\)
\(\Rightarrow x=0+1=1\)
a)2x-35=15
2x =15+35
2x =50
x =50:2
x =25
b)3x +17=2
3x =17-2
3x =15
x =15:3
x =5
c)
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...
a) x 3 = 2 3 + − 1 7 ⇔ x 3 = 2.7 + ( − 1 ) .3 21 = 11 21 ⇔ x = 11 7
b) 11 8 + 13 6 = 85 x ⇔ 11.3 + 13.4 24 = 85 x ⇔ 85 24 = 85 x ⇔ x = 24
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