麦克风多少钱一个:14.Asays B.tells C.knows D.wants 15.A.chair B.table C.plate D.bed

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"Is that my fault?You didn't come in time.Everyone ⒁＿＿people at my hotel have supper from six till eight.Come before six,you get a good supper.Come before eight,you can get a good supper or simple one.Come after.you get a clean⒂＿＿."

14.knows
15.plate

B
B

C
C

14.Asays B.tells C.knows D.wants 15.A.chair B.table C.plate D.bed 如果a/(b+c )=b/(a +c)=c/(a+b )=k 求k 值已知a.b.c为非零实数b+c/a=c+a/b=a+b/c=k求k的值 (a+b)/c+(a+c)/d+(b+c)/a=k求K的值. b( )k( ) 一道数学题( k=a/b+c=b/c+a=c/a+b;求k)快！若a/（b+c）=b/（c+a）=c/（a+b）=k，则k= (a+b+c)/d=(a+b+d)/c=(a+c+d)/b=(b+c+d)/a=k 若C分之A-2B=A分之B-2C=B分之C-2A=K，且A+B+C不等于0，则K等于多少？若a+b+c<>0,且(2a+b)/c=(2b+c)/a=(2c+a)/b=k,求k的值（<>表示不等于）