【判断题】I f export s ar e $500 , GD P i s $8000 , governmen t purchase s ar e $1200 , import s ar e $700 , an d investmen t i s $800 , then consumptio n i s $6200.
【判断题】I f consumptio n i s $1800 , GD P i s $4300 , governmen t purchase s ar e $1000 , import s ar e $700 , an d investmen t i s $1200, the n export s ar e $300.