2题,3,4小题写算式,

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2题,3,4小题写算式,
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2题,3,4小题写算式,
2题,3,4小题写算式,
 

2题,3,4小题写算式,
3、鸭700/(2/5+5/5)
=500只
鹅500*2/5=200只
4、鸭60/(1-2/5)
=100只
鹅100-60=40只