a+b+c+d+e+f+g=20a=d+e+g+1a+b=c(b+f)=2(c+f)求b的值错了,是a+c=b
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![a+b+c+d+e+f+g=20a=d+e+g+1a+b=c(b+f)=2(c+f)求b的值错了,是a+c=b](/uploads/image/z/2709583-7-3.jpg?t=a%2Bb%2Bc%2Bd%2Be%2Bf%2Bg%3D20a%3Dd%2Be%2Bg%2B1a%2Bb%3Dc%28b%2Bf%29%3D2%28c%2Bf%29%E6%B1%82b%E7%9A%84%E5%80%BC%E9%94%99%E4%BA%86%EF%BC%8C%E6%98%AFa%2Bc%3Db)
a+b+c+d+e+f+g=20a=d+e+g+1a+b=c(b+f)=2(c+f)求b的值错了,是a+c=b
a+b+c+d+e+f+g=20
a=d+e+g+1
a+b=c
(b+f)=2(c+f)
求b的值
错了,是a+c=b
a+b+c+d+e+f+g=20a=d+e+g+1a+b=c(b+f)=2(c+f)求b的值错了,是a+c=b
a+b+c+d+e+f+g=20
a=d+e+g+1,
故2a+b+c+f=19;
又(b+f)=2(c+f)
故f=b-2c,代入2a+b+c+f=19得2a+2b-c=19;
a+c=b
代入得b=(19+3c)/4
无数个解?