Bài 1a/ 7x-x+4=0b/ 6x-12=2x(x-2)c/ 7-(3x+4)=x+4d/ (x-5)(x+4)=0Bài 2a/ (x²-4x+4)=0b/ x³=x²+2x-1c/ x²-2x+1=x²d/ x²-3x-4=0Bài 3a/ x/3=5-3x/2xb/ x-5x+2/9=7-3x/12c/ 2x+3/3-7-8x/4=0d/ x/3-2x+1/12=x/6-xl
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