2(a²b-2ab²+c)-(2c+3a²b-ab²)

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2(a²b-2ab²+c)-(2c+3a²b-ab²)2(a²b-2ab²+c)-(2c+3a²b-ab²)2(a

2(a²b-2ab²+c)-(2c+3a²b-ab²)
2(a²b-2ab²+c)-(2c+3a²b-ab²)

2(a²b-2ab²+c)-(2c+3a²b-ab²)
原式=2a²b-4ab²+2c-2c-3a²b+ab²
= -a²b-3ab²
= -ab(a+3b)

2(a²b-2ab²+c)-(2c+3a²b-ab²)
=2a²b-4ab²+2c-2c-3a²b+ab²
=(2a²b-3a²b)+(ab²-4ab²)+(2c-2c)
=-a²b-3ab²