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a. 1440 : [ 120 - (3x + 9 ) ] = 120
120 - (3x + 9) = 1440 : 120 = 12
3x + 9 = 120 - 12 = 108
3x = 108 - 9 = 99
x = 99 : 3 = 33
b. 120 + [ ( 999 - 9x ) : 60 ] . 24 = 480
[ ( 999 - 9x ) : 60 ] . 24 = 480 - 120 = 360
( 999 - 9x ) : 60 = 360 : 24 = 15
( 999 - 9x ) = 15 . 60 = 900
9x = 999 - 900 = 99
x = 99 : 9 = 11
120+[(999-9x):60].24=480
[(999-9x):60].24 = 480 - 120
[(999-9x):60].24 = 360
[(999-9x):60] = 360 : 24
[(999-9x):60] = 15
(999-9x) = 15 x 60
(999-9x) = 900
9x = 999 - 900
9x = 99
x = 99 : 9
x = 11
120+[(999-9x):60]=480-120
[(999-9x):60].24=360
(999-9x):60=360:24
(999-9x):60=15
(999-9x)=15.60
999-9x=900
990x=900
x=990:900
x=?
120+[(999-9x)/60]=480/24
120+[(999-9x)/60]=20
999-9x=20-120
999-9x=-100
9x=999-(-100)
9x=1099
x=1099/9
Vậy x=1099/9
17x + 3. ( -16x – 37) = 2x + 43 - 4x
<=>17x-48x-111=-2x+43
<=>-29x=154
<=> \(x=-\frac{154}{29}\)
-3. (2x + 5) -16 < -4. (3 – 2x)
\(\Leftrightarrow-6x-31< -12+8x.\)
\(\Leftrightarrow-14x< 19\Rightarrow x< -\frac{19}{14}\)
\(-2x-\left(x-17\right)=34-\left(-x+25\right)\)
\(-2x-x+17=34+x-25\)
\(-2x-x-x=34-25-17\)
\(-4x=-8\Leftrightarrow x=2\)
\(17x-\left(16x-37\right)=2x+43\)
\(17x-16x+37=2x+43\)
\(17x-16x-2x=-37+43\)
\(-x=6\Leftrightarrow x=6\)
\(-2x-3\left(x+17\right)=34-2\left(-x+25\right)\)
\(-2x-3x-51=34+2x-50\)
\(-2x-3x-2x=34-50+51\)
\(-7x=35\Leftrightarrow x=-5\)
7x-2x=6 mũ 2 +44:11
5x=36+4
5x=40
x=40:5=8