1题:3x²+4x-7=0 2题:2x²-8x+1=0 3题:(x-1)²-4(x-1)-21=0 四题:3x²-1=4x五题:(2x+1)²=3(2x+1) 六题:x²-7x+10=0 七题:x² -2x-399=0
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