计算 3(2a+1)(2a-1)-4(3a-2)(3a+5)=
2个回答
3(2a+1)(2a-1)-4(3a-2)(3a+5)
=3(4a²-1)-4(9a²+9a-15)
=12a²-3-36a²-36a+60
=-24a²-36a+57
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