摘要：将多项式2xy2-x2y-x3y3-7按x降排列再按y升排列
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将多项式5x3y-y4+2xy2-x4按x的降幂排列是（ ）
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| A．-x4+5x3y+2xy2-y4 | B．-y4+5x3y+2xy2-y4 |
| C．-x4+5x3y-y4+2xy2 | D．2xy2+5x3y-y4-x4 |
将多项式5x3y﹣y4+2xy2﹣x4按x的降幂排列是
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A．﹣x4+5x3y+2xy2﹣y4
B．﹣y4+5x3y+2xy2﹣y4
C．﹣x4+5x3y﹣y4+2xy2
D．2xy2+5x3y﹣y4﹣x4
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B．﹣y4+5x3y+2xy2﹣y4
C．﹣x4+5x3y﹣y4+2xy2
D．2xy2+5x3y﹣y4﹣x4