已知(a一2)+(b一3)+(c一4)=0,求a+2b+3c的值?
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已知(a一2)+(b一3)+(c一4)=0,求a+2b+3c的值?
已知(a一2)+(b一3)+(c一4)=0,求a+2b+3c的值?
已知(a一2)+(b一3)+(c一4)=0,求a+2b+3c的值?