\(-6x=18\)
\(\Leftrightarrow x=\frac{18}{-6}\)
\(\Leftrightarrow x=-3\)
\(2x-\left(-3\right)=7\)
\(\Leftrightarrow2x=7-3\)
\(\Leftrightarrow2x=4\)
\(\Leftrightarrow x=\frac{4}{2}\)
\(\Leftrightarrow x=2\)
\(\left|x\right|< 6\)
\(\Leftrightarrow x\in\left\{\pm1;...\pm5\right\}\)
a , - 6x = 18
=> x = 18 : ( -6 )
=> x = -3 thuộc Z
Vậy x = - 3
b , 2x - ( - 3 ) = 7
2x + 3 = 7
=> 2x = 7 - 3
=> 2x = 4
=> x = 4 : 2
=> x = 2 thuộc Z
Vậy x = 2
c , | x | < 6
=> \(\left|x\right|\in\left\{1;2;3;4;5\right\}\)
=> \(x\in\left\{\pm1;\pm2;\pm3;\pm4;\pm5\right\}\)
a) -6x=18
x=18:(-6)
x=-3
b) 2x-(-3)=7
2x =7+3
2x =10
x =10:2
x =5
c)|x|<6
là {1;-1;2;-2;3;-3;4;-4;5;-5}
a) -6x=18
x=18:(-6)
x=-3
b)2x-(-3)=7
2x=7+(-3)
2x=4
x=4:2
x=2
c)|x|<6
=>x\(\in\){5;4;3;2;1;-5;-4;-3;-2;-1;0}
A) -6x = 18
x = 18 : (-6)
x = (-3)
B)2x - (-3) = 7
2x. = 7 + (-3)
2x. = 4
x. = 4 : 2
x. = 2
C) x € {1 ; -1 ; 2 ; -2 ; 3 ; -3 ; 4 ; - 4 ; 5 ; -5 }
P/S : € = thuộc