已知A=3a²-7x-1,B=a²-b²+c²,C=5a²-2b²-3c²,求A-(B-C)
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已知A=3a²-7x-1,B=a²-b²+c²,C=5a²-2b²-3c²,求A-(B-C)
已知A=3a²-7x-1,B=a²-b²+c²,C=5a²-2b²-3c²,求A-(B-C)
已知A=3a²-7x-1,B=a²-b²+c²,C=5a²-2b²-3c²,求A-(B-C)
A-(B-C)
=A-B+C
=(3a²-7x-1)-(a²-b²+c²)+(5a²-2b²-3c²)
=3a²-7x-1-a²+b²-c²+5a²-2b²-3c²
=7a²-7x-1-b²-4c²