计算(3a-1)(2a+3)-(6a-5)(a-4),a=-1

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计算(3a-1)(2a+3)-(6a-5)(a-4),a=-1计算(3a-1)(2a+3)-(6a-5)(a-4),a=-1计算(3a-1)(2a+3)-(6a-5)(a-4),a=-1原式=(6a&

计算(3a-1)(2a+3)-(6a-5)(a-4),a=-1
计算(3a-1)(2a+3)-(6a-5)(a-4),a=-1

计算(3a-1)(2a+3)-(6a-5)(a-4),a=-1
原式
=(6a²+9a-2a-3)-(6a²-24a-5a+20)
=6a²+7a-3-6a²+29a-20
=36a-23
=36×(-1)-23
=-59

原式=(6a²+9a-2a-3)-(6a²-24a-5a+20)
=6a²+7a-3-6a²+29a-20
=36a-23
=36×(-1)-23
=-59
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