已知a=3,b=-2,求2a[b+1/2(a²-b²)]-(a+b)²的值.过程!急!

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已知a=3,b=-2,求2a[b+1/2(a²-b²)]-(a+b)²的值.过程!急!已知a=3,b=-2,求2a[b+1/2(a²-b²)]-(a+

已知a=3,b=-2,求2a[b+1/2(a²-b²)]-(a+b)²的值.过程!急!
已知a=3,b=-2,求2a[b+1/2(a²-b²)]-(a+b)²的值.
过程!急!

已知a=3,b=-2,求2a[b+1/2(a²-b²)]-(a+b)²的值.过程!急!
解原式
=2×3{-2+1/2[3^2-(-2)^2]}-[3+(-2)]^2
=2×3[-2+1/2(9-4)]-(1)^2
=6(-2+5/2)-1
=-12+15-1
=3-1
=2

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