作业帮计算：①-5(a²-2)-2(3a²+5) ②-2（ab-3a²）-[2b²-（5ab+a²）+2ab]
来源：学生作业帮助网 编辑：作业帮 时间：2024/08/16 14:03:14
![计算：①-5(a²-2)-2(3a²+5) ②-2（ab-3a²）-[2b²-（5ab+a²）+2ab]](/uploads/image/z/1998555-51-5.jpg?t=%E8%AE%A1%E7%AE%97%EF%BC%9A%E2%91%A0-5%28a%26%23178%3B-2%29-2%283a%26%23178%3B%2B5%29+%E2%91%A1-2%EF%BC%88ab-3a%26%23178%3B%EF%BC%89-%5B2b%26%23178%3B-%EF%BC%885ab%2Ba%26%23178%3B%EF%BC%89%2B2ab%5D)
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计算：①-5(a²-2)-2(3a²+5) ②-2（ab-3a²）-[2b²-（5ab+a²）+2ab]
计算：①-5(a²-2)-2(3a²+5) ②-2（ab-3a²）-[2b²-（5ab+a²）+2ab]
计算：①-5(a²-2)-2(3a²+5) ②-2（ab-3a²）-[2b²-（5ab+a²）+2ab]
解
-5(a²-2)-2(3a²+5)
=(-5a²-6a²)+(10-10)
=-11a²
-2(ab-3a²)-[2b²-(5ab+a²)+2ab]
=-2ab+6a²-(2b²-5ab-a²+2ab)
=-2ab+6a²-(2b²-a²-3ab)
=(-2ab+3ab)+(6a²+a²)-2b²
=7a²+ab-2b²