<=>x^3-6x^2+12x-8-x^3+6x^2=7
<=>12x=15
<=> x=5/4
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Đọc tiếp
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a/(3x-5)(2x-1)-(x+2)(6x-1)=0
b/ (3x-5)(3x+2)-(3x-1)2=-5
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