Tìm x thuộc Z biết1. Tìm x thuộc Z biết : 1) x – 2 = –6 2) –5x – (–3) = 13 3) 15– ( x –7 ) = – 21 4) 3x + 17 = 2 5) 45 – ( x– 9) = –35 6) –7x – (–9) = 30 7) x + (-3) = -11 8) –8x – (–11) = 43 9) 82 – (15 + x) = 72 10) (–5) + x = 15 11) 2x – (–17) = 15 12) |x – 2| = 3. 13) | x – 3| –7 = 13 14) 72 –3.|x + 1| = 9 15) 17 – (43 – ) = 45 16) | x +9| –7 = 12 17) 3| x – 1| – 5 = 7 18) 2x + 11 = 3(x – 9) 19) –15(x – 2) + 7(3 – x) = 7 20) –12(x - 5) + 7(3 - x) = 5 21) (x – 2).(x + 4) = 0 22) (x –2).( x + 15) = 0 23) (7–x).( x + 19) = 0 24) -5< x <1 25) |x|<3 26) (x – 3)(x – 5) < 0 27) (x –5)(x–7) < 0 28) 2x2 – 3 = 29 29) –6x – (–7) = 25 30) 46 – ( x –11 ) = – 48 31) | x – 12| – 11 = 9 32) 56 – ( x –13 ) = –58 33) | x + 19| + 24 = 23 34) (x –11).( x + 5) = 0 35) 23 (67 x) = 34 36) |x +1| – 5 = 10 37) – 7 + 2x = – 37 – (– 26)
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