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.函数f(x)=a4+5a2x2-x6的导数为
A.4a3+10ax2-x6 B.4a3+10a2x-6x5
C.10a2x-6x5 D.以上都不对
A.4a3+10ax2-x6 B.4a3+10a2x-6x5