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下列计算正确的是
A.b3·b3=2b3
B.x2+x2=x4
C.(a2)3=a6
D.(ab3)2=ab6
A.x4·x4=x16 B.-x2·(-x)3=x5
C.a2·a2=2a2 D.a2+a3=a5