来源：雪球App，作者： 有所思，（https://xueqiu.com/1547031128/36894373）
今天背公式。记录一下：Cash flow from operation = net income + depreciation – increase in working capitalWorking capital = current assets – current liabilitiesCurrent assets = cash + marketable securities + accounts receivables + inventoriesCurrent liabilities = account payablesFree cash flow to equity (FCFE) = cash flow from operation – Fixed capital investment + net borrowingFixed capital investment = new fixed assets – sale of fixed assetsNet borrowing = new debt issues – debt principal repaymentFree cash flow to firm = net income + noncash charges (depreciation and amortization)-working capital investment –Fix capital investment + [interest expense(1-tax rate)]= cash flow from operation – Fixed capital investment + [interest expense(1-tax rate)]Current Ratio = (cash + account receivable + inventory)/account payableQuick Ratio = (cash + account receivable)/account payableCash flow from operation = net income + depreciation – increase in working capitalCash flow from operation = Cash collection - cash to supplier -other cash expenseOther cash expense = interest expense - increase in interest expense payable + tax expense