①–(–3ab)(2a²b+ab–1)②3ab(a²b–ab²+ab)-ab²(2a²-3ab+2a)
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![①–(–3ab)(2a²b+ab–1)②3ab(a²b–ab²+ab)-ab²(2a²-3ab+2a)](/uploads/image/z/5263622-62-2.jpg?t=%E2%91%A0%E2%80%93%EF%BC%88%E2%80%933ab%EF%BC%89%EF%BC%882a%26%23178%3Bb%2Bab%E2%80%931%EF%BC%89%E2%91%A13ab%EF%BC%88a%26%23178%3Bb%E2%80%93ab%26%23178%3B%2Bab%EF%BC%89-ab%26%23178%3B%EF%BC%882a%26%23178%3B-3ab%2B2a%EF%BC%89)
①–(–3ab)(2a²b+ab–1)②3ab(a²b–ab²+ab)-ab²(2a²-3ab+2a)
①–(–3ab)(2a²b+ab–1)②3ab(a²b–ab²+ab)-ab²(2a²-3ab+2a)
①–(–3ab)(2a²b+ab–1)②3ab(a²b–ab²+ab)-ab²(2a²-3ab+2a)
,① –(–3ab)(2a²b+ab–1)
=3ab(2a²b+ab–1)
=6a³b²+3a²b²-3ab
②3ab(a²b–ab²+ab)-ab²(2a²-3ab+2a)
=3a³b²-3a²b³+3a²b²-2a³b²+3a²b³-2a²b²
=a³b²+a²b²