如果A=3m²-m+1,B=2m²-m-7,且A+B+C=0,求C
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![如果A=3m²-m+1,B=2m²-m-7,且A+B+C=0,求C](/uploads/image/z/1811604-12-4.jpg?t=%E5%A6%82%E6%9E%9CA%3D3m%26%23178%3B-m%2B1%2CB%3D2m%26%23178%3B-m-7%2C%E4%B8%94A%2BB%2BC%3D0%2C%E6%B1%82C)
如果A=3m²-m+1,B=2m²-m-7,且A+B+C=0,求C
如果A=3m²-m+1,B=2m²-m-7,且A+B+C=0,求C
如果A=3m²-m+1,B=2m²-m-7,且A+B+C=0,求C
解析
C=0-(A+B)
=-(A+B)
=-(3m²-m+1+2m²-m-7)
=-(5m²-2m-6)
=-5m²+2m+6
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3m²-m+1+2m²-m-7+C=0
5m²-2m-6+C=0
C=-5m²+2m+6