a x a - (a-8) x (a-5) = 129怎么算,

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a x a - (a-8) x (a-5) = 129怎么算,

a x a - (a-8) x (a-5) = 129怎么算,
a x a - (a-8) x (a-5) = 129怎么算,

a x a - (a-8) x (a-5) = 129怎么算,
a x a - (a-8) x (a-5) = 129 a^2-a^2+13a-40=129 13a=129+40 a=169/13 a=13

a-(a-8)(a-5)=129 a-(a-13a+40)=129 13a=169 a=13