[(1/2a-b)^2+(1/2a+b)^2]*(2a^2-1/2b^2)先化简,其中a=3 b=-4 再求值,
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![[(1/2a-b)^2+(1/2a+b)^2]*(2a^2-1/2b^2)先化简,其中a=3 b=-4 再求值,](/uploads/image/z/8600605-61-5.jpg?t=%5B%281%2F2a-b%29%5E2%2B%281%2F2a%2Bb%29%5E2%5D%2A%EF%BC%882a%5E2-1%2F2b%5E2%29%E5%85%88%E5%8C%96%E7%AE%80%2C%E5%85%B6%E4%B8%ADa%3D3+b%3D-4+%E5%86%8D%E6%B1%82%E5%80%BC%2C)
[(1/2a-b)^2+(1/2a+b)^2]*(2a^2-1/2b^2)先化简,其中a=3 b=-4 再求值,
[(1/2a-b)^2+(1/2a+b)^2]*(2a^2-1/2b^2)先化简,其中a=3 b=-4 再求值,
[(1/2a-b)^2+(1/2a+b)^2]*(2a^2-1/2b^2)先化简,其中a=3 b=-4 再求值,
[(1/2a-b)^2+(1/2a+b)^2]*(2a^2-1/2b^2)
=(1/2a-b+1/2a+b)(1/2a-b-1/2a-b)*(2a^2-1/2b^2)
=a*(-2b)*(2a^2-1/2b^2)
=-4a^3b+ab^3
=-4*3^3*(-4)+3*(-4)^3
=16*27-3*64
=240