作业帮1/2a^2b-[3/2a^2b-2(3abc-a^2c)-4a^2c]-3abc,其中a=-1,b=-3,c=1/2
来源：学生作业帮助网 编辑：作业帮 时间：2024/04/30 03:21:53
![1/2a^2b-[3/2a^2b-2(3abc-a^2c)-4a^2c]-3abc,其中a=-1,b=-3,c=1/2](/uploads/image/z/998221-13-1.jpg?t=1%2F2a%5E2b-%5B3%2F2a%5E2b-2%283abc-a%5E2c%29-4a%5E2c%5D-3abc%2C%E5%85%B6%E4%B8%ADa%3D-1%2Cb%3D-3%2Cc%3D1%2F2)
1/2a^2b-[3/2a^2b-2(3abc-a^2c)-4a^2c]-3abc,其中a=-1,b=-3,c=1/2
1/2a^2b-[3/2a^2b-2(3abc-a^2c)-4a^2c]-3abc,其中a=-1,b=-3,c=1/2
1/2a^2b-[3/2a^2b-2(3abc-a^2c)-4a^2c]-3abc,其中a=-1,b=-3,c=1/2
原式=1/2a²b-(3/2a²b-6abc+2a²c-4a²c)-3abc
=1/2a²b-3/2a²b+6abc-2a²c+4a²c-3abc
=(1/2a²b-3/2a²b)+(6abc-3abc)+(-2a²c+4a²c)
=-a²b+3abc+2a²c
当a=-1,b=-3,c=1/2时
原式=-(-1)²×(-3)+3×(-1)×(-3)×1/2+2×(-1)²×1/2
=-1×(-3)+3×(-1)×(-3)×1/2+2×1×1/2
=3+9/2+1
=17/2