Помогите пожалуйста 1057 Верно ли, что если:
1) |x| < 20, то -10 < x + 10 < 30;
2) |x| <= 5, то – 50 <= -10x <= 50;
3) |x| < 1,2, TO-4 < 5x - 1 < 7
4) |х| <= 3/11, то 5/11 < 8/11 - х < 1?​
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