已知2x-y=-1/3,x+y=15.则多项式2x2+xy-y2的值为
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已知2x-y=-1/3,x+y=15.则多项式2x2+xy-y2的值为
已知2x-y=-1/3,x+y=15.则多项式2x2+xy-y2的值为
已知2x-y=-1/3,x+y=15.则多项式2x2+xy-y2的值为
2x2+xy-y2
=(2x-y)(x+y)
=-1/3*15
=-5
2x2+xy-y2=(2x-y)(x+y)=(-1/3)*(15)=-5
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