โจ Best Answer โจ
b-7=Aใจใใใจ
(a-b+7)(a+b-7)=(a-(b-7))(a+(b-7))
=(a-A)(a+A)=aยฒ-Aยฒ=aยฒ-(b-7)ยฒ=aยฒ-bยฒ+14b-49
Mathematics
Junior High
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0 (Z-ใ6TZU(Zใญใ ใผ7)
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