2(a-4)(a+3)-(2a-1)(a-1)
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2(a-4)(a+3)-(2a-1)(a-1)2(a-4)(a+3)-(2a-1)(a-1)2(a-4)(a+3)-(2a-1)(a-1)原式=2*(a^2-a-12)-(2a^2-3a+1)=2a^
2(a-4)(a+3)-(2a-1)(a-1)
2(a-4)(a+3)-(2a-1)(a-1)
2(a-4)(a+3)-(2a-1)(a-1)
原式=2*(a^2-a-12)-(2a^2-3a+1)
=2a^2-2a-24-2a^2+3a-1
=(2-2)a^2+(3-2)a-24-1
=a-25
2(a-4)(a+3)-(2a-1)(a-1)
=2(a²-a-12)-(2a²-3a+1)
=a-25
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