帮我做一下啊 急用 谢谢了!!!

2024-12-27 08:40:03
推荐回答(1个)
回答1:

原式=4x^2+9y^2+12xy-(4x^2-y^2)
=10y^2+12xy
=10*(-1/2)^2+12*1/3*(-1/2)
=5/2-2
=1/2