Question

Tìm x:

a) | (x – 3) . ( x+2) |

b) | x – 2 | ≤ 1

c) | 15 – 2 | ≥ 13

Answer 1

a, Không có số liệu để tìm x

b, x ϵ {1;2;3}

c, Không có x

Answer 2

a, /(x - 3).(x + 2)/ = 0

=> (x - 3) . (x + 2) = 0

=> \(\left[\begin{array}{nghiempt}x-3=0\\x+2=0\end{array}\right.\)

=> \(\left[\begin{array}{nghiempt}x=0+3=3\\x=0-2=-2\end{array}\right.\)

=> x ϵ {3;-2}

Answer 3

b, /x - 2/ \(\le\)1

=> x - 2 ϵ {1;0;-1}

=> \(\left[\begin{array}{nghiempt}x-2=1\\x-2=0\\x-2=-1\end{array}\right.\)

=>\(\left[\begin{array}{nghiempt}x=1+2=3\\x=0+2=2\\x=-1+2=1\end{array}\right.\)

=> x ϵ {3;2;1}

Answer 4

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