質問: if `p=a^2-b^2+2a b ,\ q=a^2+4b^2-6a b\ ,` `r=b^2+b ,\ s=a^2-4a b` and `t=-2a^2+b^2-a b+adot` find `p+q+r+s-tdot` if `p=a^2-b^2+2a b ,\ q=a^2+4b^2-6a b\ ,` `r=b^2+b ,\ s=a^2-4a b` and `t=-2a^2+b^2-a b+adot` find `p+q+r+s-tdot`
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