来自康清林的问题
急用化简后求值:(3a-1)(3a-2)-3(2-5a+3a^2),其中a=-1/3.
急用
化简后求值:(3a-1)(3a-2)-3(2-5a+3a^2),其中a=-1/3.
1回答
2020-02-01 01:12
急用化简后求值:(3a-1)(3a-2)-3(2-5a+3a^2),其中a=-1/3.
急用
化简后求值:(3a-1)(3a-2)-3(2-5a+3a^2),其中a=-1/3.
(3a-1)(3a-2)-3(2-5a+3a^2)
=(3a-1)(3a-2)-3(3a-2)(a-1)
=(3a-2)[3a-1-3(a-1)]
=2(3a-2)
=2*(-1-2)
=-6