输入的命令是zsx<-sfa(log(产量)~log(种子用种量)+log(化肥用量)+log(每亩用工)+log(生产性服务支出)+log(种子用种量)^2+log(化肥用量)^2+log(每亩用工)^2+log(生产性服务支出)^2+log(种子用种量)*log(化肥用量)+log(种子用种量)*log(每亩用工)+log(种子用种量)*log(生产性服务支出)+log(化肥用量)*log(每亩用工)+log(化肥用量)*log(生产性服务支出)+log(每亩用工)*log(生产性服务支出)

救救孩子吧！！