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Bài 1: Tính hợp lí a) |-525|-(-635) -475-(525+635) b) 15.(-24)+(-24).84-24 c) 27.(-16)+(-16).74+16 Bài 2: Tìm x a) 2(x+4)-16=98+x b) (6x-18) ( 4x-24)=0 c) (5x+45) (7-x)-1=-1
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