(-x^2+3xy-0.5y^2)-(0.5x^2+4xy-1.5y^2)=-0.5x^2+( )+y^2
来源:学生作业帮助网 编辑:六六作业网 时间:2024/12/23 10:33:39
(-x^2+3xy-0.5y^2)-(0.5x^2+4xy-1.5y^2)=-0.5x^2+()+y^2(-x^2+3xy-0.5y^2)-(0.5x^2+4xy-1.5y^2)=-0.5x^2+()
(-x^2+3xy-0.5y^2)-(0.5x^2+4xy-1.5y^2)=-0.5x^2+( )+y^2
(-x^2+3xy-0.5y^2)-(0.5x^2+4xy-1.5y^2)=-0.5x^2+( )+y^2
(-x^2+3xy-0.5y^2)-(0.5x^2+4xy-1.5y^2)=-0.5x^2+( )+y^2
(-x^2+3xy-0.5y^2)-(0.5x^2+4xy-1.5y^2)
=-x^2+3xy-0.5y^2-0.5x^2-4xy+1.5y^2
=-1.5x^2-xy+y^2
所以填-xy