1、张大爷养了200只鹅,鹅的只数是鸭的2/5.养了多少只鸭?设养了X只鸭2/5X=2002/5X÷2/5=200k÷2/5X=200乘5/2X=5002、张大爷养了200只鹅,鹅的只数比鸭少3/5.养了多少只鸭?设养了X只鸭X－3/5X=2002/5X÷2/5=200÷2/

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