(-a²)·a³·(-2a)³+(-2ab)²·(-a)³·b=?
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(-a²)·a³·(-2a)³+(-2ab)²·(-a)³·b=?
(-a²)·a³·(-2a)³+(-2ab)²·(-a)³·b=?
(-a²)·a³·(-2a)³+(-2ab)²·(-a)³·b=?
(-a²)·a³·(-2a)³+(-2ab)²·(-a)³·b
=2a的8次方-4a²b²*a³*b
=2a的8次方-4a的5次方b³
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