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Toán Lớp 7: bài 1 a)|5x-4|= |x+2| b)|3-7x|=|2x-5| b2. |x+1|+|x+2|+|x+3|=4x b3 a)(15-3x)(2x+8)>0

Home/ Toán Lớp 7: bài 1 a)|5x-4|= |x+2| b)|3-7x|=|2x-5| b2. |x+1|+|x+2|+|x+3|=4x b3 a)(15-3x)(2x+8)>0

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