1.若a/b+c=b/a+c=c/a+b=k,求k的值(有两个答案) 2.若a/b=c/d=e/5=3,求(2a+c-e+3)/(2b+d-5+1)的值 3.若a/b=c/d=e/5=e,且a+c+e=5,求b+d+5的值
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![1.若a/b+c=b/a+c=c/a+b=k,求k的值(有两个答案) 2.若a/b=c/d=e/5=3,求(2a+c-e+3)/(2b+d-5+1)的值 3.若a/b=c/d=e/5=e,且a+c+e=5,求b+d+5的值](/uploads/image/z/11188277-53-7.jpg?t=1.%E8%8B%A5a%2Fb%2Bc%3Db%2Fa%2Bc%3Dc%2Fa%2Bb%3Dk%2C%E6%B1%82k%E7%9A%84%E5%80%BC%EF%BC%88%E6%9C%89%E4%B8%A4%E4%B8%AA%E7%AD%94%E6%A1%88%EF%BC%89+2.%E8%8B%A5a%2Fb%3Dc%2Fd%3De%2F5%3D3%2C%E6%B1%82%282a%2Bc-e%2B3%29%2F%282b%2Bd-5%2B1%29%E7%9A%84%E5%80%BC+3.%E8%8B%A5a%2Fb%3Dc%2Fd%3De%2F5%3De%2C%E4%B8%94a%2Bc%2Be%3D5%2C%E6%B1%82b%2Bd%2B5%E7%9A%84%E5%80%BC)
1.若a/b+c=b/a+c=c/a+b=k,求k的值(有两个答案) 2.若a/b=c/d=e/5=3,求(2a+c-e+3)/(2b+d-5+1)的值 3.若a/b=c/d=e/5=e,且a+c+e=5,求b+d+5的值
1.若a/b+c=b/a+c=c/a+b=k,求k的值(有两个答案)
2.若a/b=c/d=e/5=3,求(2a+c-e+3)/(2b+d-5+1)的值
3.若a/b=c/d=e/5=e,且a+c+e=5,求b+d+5的值
1.若a/b+c=b/a+c=c/a+b=k,求k的值(有两个答案) 2.若a/b=c/d=e/5=3,求(2a+c-e+3)/(2b+d-5+1)的值 3.若a/b=c/d=e/5=e,且a+c+e=5,求b+d+5的值
1.若a/b+c=b/a+c=c/a+b=k,求k的值(有两个答案)
a=k(b+c)
b=k(c+a)
c=k(a+b)
相加
a+b+c=k(b+c+c+a+a+b)=2k(a+b+c)
2k(a+b+c)-(a+b+c)=0
(a+b+c)(2k-1)=0
若a+b+c=0
则(b+c)=-a
k=a/(b+c)=a/(-a)=0
若a+b+c不等于0
则2k-1=0
k=1/2
即k=1/2或k=-1
2.若a/b=c/d=e/5=3,求(2a+c-e+3)/(2b+d-5+1)的值
a=3b,c=3d,e=15
(2a+c-e+3)/(2b+d-5+1)
=(6b+3d-15+3)/(2b+d-4)
=3(2b+d-4)/(2b+d-4)
=3
3.若a/b=c/d=e/5=e,且a+c+e=5,求b+d+5的值
是不是这样的:a/b=c/d=e/5=3?
那么根据题意
a=3b c=3d e=15
则
3b+3d+15=5
b+d+5=5/3