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218-(x+31)=x-29
218-31=x+x-29
2x=218-31+29=218-(31-29)
2x=218-2=216
x=216/2
x=108
218-(x+31)=x-29
218-x-31=x-29
(218-31)-x=x-29
187-x=x-29 -x=x-29-187 -2x=-158 x=-158/-2 x=79218 - (x +31) = x - 29
218 - x -31 = x - 29
(218 - 31) - x = x - 29
187 - x = x - 29 - x = x - 29 -187 - 2x = -158x = -158x-2x = 79
Ta có : 218 - ( x + 81 ) = x - 29
\( \implies\) 218 - x - 81 = x - 29
\( \implies\) 137 - x = x - 29
\( \implies\) 2x = 166
\( \implies\) x = 83
218 - (x +31)=x - 29
218 - x -31=x-29
218-x=x-29+31
218-x=x+2
x+2=218-x
2=218-x-x
2=218-Xx2
xX2=218-2
Xx2=216
x=216:2
x=108
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
\(210-\left(x+31\right)=-29\)
\(\Rightarrow\left(x+31\right)=210-\left(-29\right)\)
\(\Rightarrow x+31=239\)
\(\Rightarrow x=239-31=208\)
\(-\frac{5}{2}< \frac{3}{x}< \frac{2}{3}\)
Các số nguyên x thỏa mãn là: x \(\in\left\{5;6;......\right\}\)
\(218-\left(x+31\right)=x-29\)
\(\Leftrightarrow\)\(218-x-31=x-29\)
\(\Leftrightarrow\)\(187-x=x-29\)
\(\Leftrightarrow\)\(2x=216\)
\(\Leftrightarrow\)\(x=108\)
Vậy....
218-(x + 31) = x - 29
=> 218 - x - 31 = x - 29
=> (218-31) - x = x - 29
=> 187 - x = x - 29
=> -x - x = -29 - 187
=> -2x = -216
=> x = -216 : (-2)
=> x = 108