先化简,再求值:-(3a²-4)-(a²-3a+5)+(4a-a²),其中a=-3
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先化简,再求值:-(3a²-4)-(a²-3a+5)+(4a-a²),其中a=-3
先化简,再求值:-(3a²-4)-(a²-3a+5)+(4a-a²),其中a=-3
先化简,再求值:-(3a²-4)-(a²-3a+5)+(4a-a²),其中a=-3
:-(3a²-4)-(a²-3a+5)+(4a-a²)
=-3a²+4-a²+3a-5+4a-a²
=-5a²+7a-1
a=-3 时,原式=-5×9-21-1=-67
-3a²+4-a²+3a-5+4a-a²
=-5a²+7a-1
=-5x9-21-1
=-45-21-1
=-67