化简求值:(3a-7)(3a+7)-2a(2/9a-1),其中a=-3
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![化简求值:(3a-7)(3a+7)-2a(2/9a-1),其中a=-3](/uploads/image/z/1241618-50-8.jpg?t=%E5%8C%96%E7%AE%80%E6%B1%82%E5%80%BC%EF%BC%9A%283a-7%29%283a%2B7%29-2a%282%2F9a-1%29%2C%E5%85%B6%E4%B8%ADa%3D-3)
化简求值:(3a-7)(3a+7)-2a(2/9a-1),其中a=-3
化简求值:(3a-7)(3a+7)-2a(2/9a-1),其中a=-3
化简求值:(3a-7)(3a+7)-2a(2/9a-1),其中a=-3
(3a-7)(3a+7)-2a(2分之9a-1)
=9a平方 - 49 - 9a平方+2a
=2a-49
=2*(-3)-49
=-6-49
=-55