计算:(1) 2(x-y)³[-2分之1(y-x)³]² (2)(2) 2(a²)³×a³-(3a³)³+(5a²)²×a的5次方-(-5a²)²×a的5次方(3) 3(a²)的4次方×(a³)³-(-a)×(a的4次方)
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