2xy-1/2(4xy-8x²y²)+2(3xy-5x²y²),其中x=3/2,y=-2/3
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/28 15:46:39
![2xy-1/2(4xy-8x²y²)+2(3xy-5x²y²),其中x=3/2,y=-2/3](/uploads/image/z/2605261-13-1.jpg?t=2xy-1%2F2%EF%BC%884xy-8x%26%23178%3By%26%23178%3B%EF%BC%89%2B2%EF%BC%883xy-5x%26%23178%3By%26%23178%3B%EF%BC%89%2C%E5%85%B6%E4%B8%ADx%3D3%2F2%2Cy%3D-2%2F3)
2xy-1/2(4xy-8x²y²)+2(3xy-5x²y²),其中x=3/2,y=-2/3
2xy-1/2(4xy-8x²y²)+2(3xy-5x²y²),其中x=3/2,y=-2/3
2xy-1/2(4xy-8x²y²)+2(3xy-5x²y²),其中x=3/2,y=-2/3
x=3/2,y=-2/3
xy=3/2*(-2/3)=-1
2xy-1/2(4xy-8x²y²)+2(3xy-5x²y²)
=2xy-2xy+4x²y²+6xy-10x²y²
=(2-2+6)xy+(4-10)x²y²
=6xy-6x²y²
=6xy(1-xy)
=-1*[1-(-1)]
=1*2
=2