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tuan10a2ql
2 năm trước
bài 1:giải các phương trình sau: 1.4x2-12x-7=0 2.x4-5x2+4=0 3.x-2-2 căn x-2=8 4.3x2-8x+5=0 5.(2x-1)(x-3)=-2x+2 6.5x2-6x+1=0 7.4x4-5x2-9=0
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