作业帮4x²y-1/2{x²y-[5x²y-2(2xy²+1/4xy)]}+3xy²,其中x=2,y=-3
来源：学生作业帮助网 编辑：作业帮 时间：2024/05/02 16:27:59
![4x²y-1/2{x²y-[5x²y-2(2xy²+1/4xy)]}+3xy²,其中x=2,y=-3](/uploads/image/z/1682909-53-9.jpg?t=4x%26%23178%3By-1%2F2%7Bx%26%23178%3By-%5B5x%26%23178%3By-2%282xy%26%23178%3B%2B1%2F4xy%29%5D%7D%2B3xy%26%23178%3B%2C%E5%85%B6%E4%B8%ADx%3D2%2Cy%3D-3)
4x²y-1/2{x²y-[5x²y-2(2xy²+1/4xy)]}+3xy²,其中x=2,y=-3
4x²y-1/2{x²y-[5x²y-2(2xy²+1/4xy)]}+3xy²,其中x=2,y=-3
4x²y-1/2{x²y-[5x²y-2(2xy²+1/4xy)]}+3xy²,其中x=2,y=-3
4x²y-1/2{x²y-[5x²y-2(2xy²+1/4xy)]}+3xy²
=4x²y-1/2{x²y-[5x²y-4xy²-1/2xy]}+3xy²
=4x²y-1/2{x²y-5x²y+4xy²+1/2xy}+3xy²
=4x²y-1/2{-4x²y-4xy²-1/2xy}+3xy²
=4x²y+2x²y+2xy²+1/4xy+3xy²
=6x²y+5xy²+1/4xy
=xy(6x+5y+1/4)
=-2×3×（6×2-5×3+1/4）
=-6×（-11/4）
=16.5
很好啊