一个单项式减去x2-y2得x2+y2，则这个单项式是（ ）
A. 2y2
B. -2y2
C. 2x2
D. -2x2
人气：452 ℃ 时间：2019-11-13 06:04:26
解答
单项式为：x2-y2+（x2+y2）
=（1+1）x2+（-1+1）y2
=2x2．
故选C．
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