CFA二级原版书Equity问题？已经快疯了 increase, Equity, decrease, 而且, accounts

freshprince

这里的WCINV答案给的是39+44-22-23=38啊？公式是WCI = increase in a/r + increase in inventory - increase in accounts payable - increase in accrued taxes and liabilities，这里的invinventory和AR都是decrease，为什么答案里就变成正的了？而且Inventory和AR的增加应该是减少WCINV啊，我的理解是WCINV=39+44+22+23.请各位大神帮帮忙，谢谢了