已知x^2+xy=3,xy+y^2=－2,求下列各式的值 1. x^2-y^2 (2.) x^2+4xy+3y^2已知x^2+xy=3,xy+y^2=－2,求下列各式的值 1. x^2-y^2 2. x^2+4xy+3y^2

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已知x^2+xy=3,xy+y^2=－2,求下列各式的值 1. x^2-y^2 (2.) x^2+4xy+3y^2已知x^2+xy=3,xy+y^2=－2,求下列各式的值 1. x^2-y^2 2. x^2+4xy+3y^2
已知x^2+xy=3,xy+y^2=－2,求下列各式的值 1. x^2-y^2 (2.) x^2+4xy+3y^2
已知x^2+xy=3,xy+y^2=－2,求下列各式的值
1. x^2-y^2
2. x^2+4xy+3y^2

已知x^2+xy=3,xy+y^2=－2,求下列各式的值 1. x^2-y^2 (2.) x^2+4xy+3y^2已知x^2+xy=3,xy+y^2=－2,求下列各式的值 1. x^2-y^2 2. x^2+4xy+3y^2
1.
x^2-y^2=(x^2+xy)-(xy+y^2)
=3-(-2)
=5
2.
x^2+4xy+3y^2=(x^2+xy)+3(xy+y^2)
=3+3*(-2)
=-3

x^2-y^2=（x^2+xy）—(xy+y^2)=3+2=5
x^2+4xy+3y^2=（x^2+xy）+3（xy+y^2)=3-6=-3

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