Bài 1:tìm ước của a sao cho Ư(a)thuộc Z a : -24 -7 -6 8 126 Ước của a: … … … … … số ước của a: … … … … … Bài 2: tính giá trị của biểu thức p) (-55).(-25).(-x) với x=8 q) (-1).(-2).(-3).(-4).(-5).(-x) với x= -10 r) 12.(-3).(-7).x với x= -2 Bài 3: a)Tìm tất cả các ước của 15 mà lớn hơn -5 b) tìm x, biết xchia hết cho 13 và -14 < x < 27 giúp mik với mik đang cần gấp

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