5a²+[a²+(5a²-3a²)-6(a²-a)],其中a=负二分之一,

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5a²+[a²+(5a²-3a²)-6(a²-a)],其中a=负二分之一,5a²+[a²+(5a²-3a²)-

5a²+[a²+(5a²-3a²)-6(a²-a)],其中a=负二分之一,
5a²+[a²+(5a²-3a²)-6(a²-a)],其中a=负二分之一,

5a²+[a²+(5a²-3a²)-6(a²-a)],其中a=负二分之一,
5a²+[a²+(5a²-3a²)-6(a²-a)],
=5a²+(a²+2a²-6a²+6a)
=5a²+a²+2a²-6a²+6a
=2a²+6a
=2*1/4+6*(-1/4)
=1/2-3/2
=-1