已知A=-7a²-5a-1,B=2a²-3a+1,且2A-3B+C=0,求C
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![已知A=-7a²-5a-1,B=2a²-3a+1,且2A-3B+C=0,求C](/uploads/image/z/683744-32-4.jpg?t=%E5%B7%B2%E7%9F%A5A%3D-7a%26%23178%3B-5a-1%2CB%3D2a%26%23178%3B-3a%2B1%2C%E4%B8%942A-3B%2BC%3D0%2C%E6%B1%82C)
已知A=-7a²-5a-1,B=2a²-3a+1,且2A-3B+C=0,求C
已知A=-7a²-5a-1,B=2a²-3a+1,且2A-3B+C=0,求C
已知A=-7a²-5a-1,B=2a²-3a+1,且2A-3B+C=0,求C
已知A=-7a²-5a-1,B=2a²-3a+1,且2A-3B+C=0,求C
C
=3B-2A
=3(2a²-3a+1)-2(-7a²-5a-1)
=20a²+a+5