已知a+b=3.ab=-2,求3a²-2a²b²+3b²的值
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已知a+b=3.ab=-2,求3a²-2a²b²+3b²的值
已知a+b=3.ab=-2,求3a²-2a²b²+3b²的值
已知a+b=3.ab=-2,求3a²-2a²b²+3b²的值
3a²-2a²b²+3b²
=3(a²+b²+2ab)-6ab-2(ab)²
=3(a+b)²-6x(-2)-2x(-2)²
=3x3²+12-8
=9+4
=13
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