设B≠C,且满足(√3+1)(A-B)+√2(B-C)=A-C,则A-B/B-C的值是().
问题描述:
设B≠C,且满足(√3+1)(A-B)+√2(B-C)=A-C,则A-B/B-C的值是().
A大于0
B等于0
C小于0
D正负号不确定
答
选C:
(√3+1)(A-B)+√2(B-C)=A-C,
(√3+1)A-(√3+1)B+√2B-√2C=A-C,
(√3+1)A-(√3+1)B+√2B-√2C-A+C=0,
√3A-√3B+(√2-1)B+(1-√2)C=0,
√3A-√3B+(√2-1)(B-C)=0,
√3(A-B)=-(√2-1)(B-C),
(A-B)/(B-C)=-(√2-1)/√30,√2-1>0