(a-1)(3a+5)-(6a²-2a)÷(-2a)过程快.
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(a-1)(3a+5)-(6a²-2a)÷(-2a)过程快.(a-1)(3a+5)-(6a²-2a)÷(-2a)过程快.(a-1)(3a+5)-(6a²-2a)÷(-2a
(a-1)(3a+5)-(6a²-2a)÷(-2a)过程快.
(a-1)(3a+5)-(6a²-2a)÷(-2a)过程快.
(a-1)(3a+5)-(6a²-2a)÷(-2a)过程快.
(a-1)(3a+5)-(6a²-2a)÷(-2a)
=3a²+5a-3a-5-(-3a+1)
=3a²+2a-5+3a-1
=3a²+5a-6