242.【alancui】5 machines with the same productivity, if 4 machines work together, it will take A hours to finish a job. If put 5 machines into work, how many hours will be saved. (A是个特定的值,具体记不得了,这道还是很简单的) A乘以(4/5-1)=四分之一A
242.【alancui】5 machines with the same productivity, if 4 machines work together, it will take A hours to finish a job. If put 5 machines into work, how many hours will be saved. (A是个特定的值,具体记不得了,这道还是很简单的) A乘以(4/5-1)=四分之一A
242.【alancui】5 machines with the same productivity, if 4 machines work together, it will take A hours to finish a job. If put 5 machines into work, how many hours will be saved. (A是个特定的值,具体记不得了,这道还是很简单的) A乘以(4/5-1)=四分之一A