已知: a+b+c=0 且: 1/(a+1)+1/(b+2)+1/(c+3)=0 求: (a+1)^2+(b+2)^2+(c+3)^2=?
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a+b+c=0.(1式)
1/(a+1)+1/(b+2)+1/(c+3)=0.(2式)
(a+1)^2+(b+2)^2+(c+3)^2.(3式)
有1式得(a+1)+(b+2)+(c+3)=6
由2式通分得(b+2)*(c+3)+(a+1)*(c+3)+(a+1)*(b+2)=0.(4式)
为方便解题设(a+1)=A (b+2)=B (c+3)=C
4式为BC+AC+AB=0
3式为 A^2+B^2+C^2
由1式平方得A^2+B^2+C^2+2AB+2BC+2AC=36
得出3式A^2+B^2+C^2=36
即(a+1)^2+(b+2)^2+(c+3)^2=36
1/(a+1)+1/(b+2)+1/(c+3)=0.(2式)
(a+1)^2+(b+2)^2+(c+3)^2.(3式)
有1式得(a+1)+(b+2)+(c+3)=6
由2式通分得(b+2)*(c+3)+(a+1)*(c+3)+(a+1)*(b+2)=0.(4式)
为方便解题设(a+1)=A (b+2)=B (c+3)=C
4式为BC+AC+AB=0
3式为 A^2+B^2+C^2
由1式平方得A^2+B^2+C^2+2AB+2BC+2AC=36
得出3式A^2+B^2+C^2=36
即(a+1)^2+(b+2)^2+(c+3)^2=36
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