作业帮3y^2-x^2+(2x-y)-(x^2+3y^2) 其中x=1 y=-2
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3y^2-x^2+(2x-y)-(x^2+3y^2) 其中x=1 y=-2
3y^2-x^2+(2x-y)-(x^2+3y^2) 其中x=1 y=-2
3y^2-x^2+(2x-y)-(x^2+3y^2) 其中x=1 y=-2
3y^2-x^2+(2x-y)-(x^2+3y^2)
=3y^2-x^2+2x-y-x^2-3y^2
=-2x^2+2x-y
=-2×1+2×1-（-2）
=2
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