1ã
2x^2-3x-3/2=0
â³=(-3)^2-4*2*(-3/2)
=9+12
12ï¼0
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2ã
16x^2-24x+9=0
â³=(-24)^2-4*16*9
=576-576
=0
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3ã
x^2-4â2x+9=0
â³=(-4â2)^2-4*1*9
=32-36
=-4ï¼0
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4ã
3x^2+10=2x^2+8x
å³x^2-8x+10=0
â³=(-8)^2-4*1*10
=64-40
=24ï¼0
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