1.(4a-b²)·(-2b) 2.2x²﹙x-1/2) 3.5ab·(2a-b+0.2) 4.﹙2a²-2/3a-4/9﹚·﹙-9a﹚

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1.(4a-b²)·(-2b) 2.2x²﹙x-1/2) 3.5ab·(2a-b+0.2) 4.﹙2a²-2/3a-4/9﹚·﹙-9a﹚
1.(4a-b²)·(-2b)
2.2x²﹙x-1/2)
3.5ab·(2a-b+0.2)
4.﹙2a²-2/3a-4/9﹚·﹙-9a﹚

1.(4a-b²)·(-2b) 2.2x²﹙x-1/2) 3.5ab·(2a-b+0.2) 4.﹙2a²-2/3a-4/9﹚·﹙-9a﹚
1.-8ab+2b³
2.2x³-x²
3.10a²b-5ab²+ab
4.-18a³+6a²+4a