来自石险峰的问题
【已知正数a,b,c,满足ab+a+b=bc+b+c=ca+c+a=99,则(a+1)(b+1)(c+1)=______.】
已知正数a,b,c,满足ab+a+b=bc+b+c=ca+c+a=99,则(a+1)(b+1)(c+1)=______.
1回答
2020-06-20 11:16
【已知正数a,b,c,满足ab+a+b=bc+b+c=ca+c+a=99,则(a+1)(b+1)(c+1)=______.】
已知正数a,b,c,满足ab+a+b=bc+b+c=ca+c+a=99,则(a+1)(b+1)(c+1)=______.
∵ab+a+b=bc+b+c=ca+c+a=99,
∴ab+a+b+1=bc+b+c+1=ca+c+a+1=100,
∴(a+1)(b+1)=(b+1)(c+1)=(a+1)(c+1)=100,
∴(a+1)(b+1)(b+1)(c+1)(a+1)(c+1)=1000000,
因为abc为正数,等式两边同时开方得,
(a+1)(b+1)(c+1)=1000.