问题:
计算:-x 2-x 3n-x=( )
A.x6n
B.-x3n+2
C.x3n+3
D.-x3n+3
计算:-x 2-x 3n-x=( )
A.x6n | B.-x3n+2 | C.x3n+3 | D.-x3n+3 |
参考答案: