已知a+b=4,ab=3,求3a²b+3ab²
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已知a+b=4,ab=3,求3a²b+3ab²
已知a+b=4,ab=3,求3a²b+3ab²
已知a+b=4,ab=3,求3a²b+3ab²
3a²b+3ab²
=3ab(a+b)
=3×3×4
=36
3a²b+3ab²
=3ab(a+b)
=3*3*4
=36
3*3*4=36