Respuesta :

Use the PEMDAS rule. So first do whatever is in the parenthesis. 8 squared is 64 so 65-64 is 1 and 1-2 is -1
you would first do 13x5 which equals 65, then you would 8x8 which equals 64, then you would subtract 65-64 which equals 1, finally you would subtract 2-1, which equals 1, im pretty sure im right, but dont be afraid to tell me if im wrong :)

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good job