(-a^2b+2a)*a-3(ba^3+2a^2),看不懂的话看下面(-a²b+2a)*a-3(ba³+2a²)

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(-a^2b+2a)*a-3(ba^3+2a^2),看不懂的话看下面(-a²b+2a)*a-3(ba³+2a²)
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(-a^2b+2a)*a-3(ba^3+2a^2),看不懂的话看下面(-a²b+2a)*a-3(ba³+2a²)
(-a^2b+2a)*a-3(ba^3+2a^2),看不懂的话看下面
(-a²b+2a)*a-3(ba³+2a²)

(-a^2b+2a)*a-3(ba^3+2a^2),看不懂的话看下面(-a²b+2a)*a-3(ba³+2a²)
原式=-a³b+2a²-3a³b-6a²
=-4a³b-4a²