已知A=a²+b²-c²,B=c²-a²+4b²,且A+B+C=0,则C=________.
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已知A=a²+b²-c²,B=c²-a²+4b²,且A+B+C=0,则C=________.
已知A=a²+b²-c²,B=c²-a²+4b²,且A+B+C=0,则C=________.
已知A=a²+b²-c²,B=c²-a²+4b²,且A+B+C=0,则C=________.
A+B=a²+b²-c²+c²-a²+4b²=b²+4b²=5b²
A+B+C=5b²+C=0
C=-5b²