作业帮计算：① -3(2x²-xy)-4(x²-xy-6) ②5a²-[（5a²-2a）-2（a²-3a）]
来源：学生作业帮助网 编辑：作业帮 时间：2024/04/29 19:21:03
![计算：① -3(2x²-xy)-4(x²-xy-6) ②5a²-[（5a²-2a）-2（a²-3a）]](/uploads/image/z/989065-1-5.jpg?t=%E8%AE%A1%E7%AE%97%EF%BC%9A%E2%91%A0+-3%282x%26%23178%3B-xy%29-4%28x%26%23178%3B-xy-6%29+%E2%91%A15a%26%23178%3B-%5B%EF%BC%885a%26%23178%3B-2a%EF%BC%89-2%EF%BC%88a%26%23178%3B-3a%EF%BC%89%5D)
计算：① -3(2x²-xy)-4(x²-xy-6) ②5a²-[（5a²-2a）-2（a²-3a）]
计算：① -3(2x²-xy)-4(x²-xy-6) ②5a²-[（5a²-2a）-2（a²-3a）]
计算：① -3(2x²-xy)-4(x²-xy-6) ②5a²-[（5a²-2a）-2（a²-3a）]
① -3(2x²-xy)-4(x²-xy-6)
=-6x²+3xy-4x²+4xy+24
=-10x²+7xy+24
②5a²-[（5a²-2a）-2（a²-3a）]
=5a²-(5a²-2a-2a²+6a)
=5a²-(3a²+4a)
=5a²-3a²-4a
=2a²-4a
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