合并同类项 6a²-[7a²-3a-(a²-4a)]
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合并同类项6a²-[7a²-3a-(a²-4a)]合并同类项6a²-[7a²-3a-(a²-4a)]合并同类项6a²-[7a
合并同类项 6a²-[7a²-3a-(a²-4a)]
合并同类项 6a²-[7a²-3a-(a²-4a)]
合并同类项 6a²-[7a²-3a-(a²-4a)]
6a²-[7a²-3a-(a²-4a)]
= 6a²-[7a²-3a-a²+4a]
= 6a²-[6a²+a]
= 6a²-6a²-a
=-a