问题
选择题
| 下列运算正确的是( ) |
| A.x2 +x 3 =x5 B.(x+y)2 =x2 +y2 C.(2xy2)3 =6x3 y6 D.-(x-y)=-x+y |
答案
答案：D
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| 下列运算正确的是( ) |
| A.x2 +x 3 =x5 B.(x+y)2 =x2 +y2 C.(2xy2)3 =6x3 y6 D.-(x-y)=-x+y |
答案：D