12x²-7=5x
12x²-5x-7=0
â³=(-5)²-4*12*(-7)=25+336=361>0
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x²-5x=2
x²-5x-2=0
â³=(-5)²-4*(-2)=25+8=33>0
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16x²-8â2x+2=0
â³=(-8â2)²-4*16*2=128-128=0
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3x²=2x-4
3x²-2x+4=0
â³=(-2)²-4*3*4=2-48=-46<0
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æ 解
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