作业帮0.2X^2Y-0.5XY^2-0.3X^2Y+0.7X^2Y,当x=-1,y=2/3时,最后=?
来源：学生作业帮助网 编辑：作业帮 时间：2024/11/15 23:28:57
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0.2X^2Y-0.5XY^2-0.3X^2Y+0.7X^2Y,当x=-1,y=2/3时,最后=?
0.2X^2Y-0.5XY^2-0.3X^2Y+0.7X^2Y,当x=-1,y=2/3时,最后=?
0.2X^2Y-0.5XY^2-0.3X^2Y+0.7X^2Y,当x=-1,y=2/3时,最后=?
先对原式化简,0.2X^2Y-0.5XY^2-0.3X^2Y+0.7X^2Y=（0.2-0.3+0.7）X^2Y-0.5XY^2=0.6X^2Y-0.5XY^2=XY（0.6X-0.5Y）,然后将X,Y值带入.=（-1）×2/3×【0.6×（-1）-0.5×2/3】=2/3×14/15=28/45
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