怎样简便就怎样算.987
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怎样简便就怎样算
①987-(287+135)
=987-287-135
=700-135
=565
②487-139-61-287
=487-287-(139+61)
=200-200
=0
③156+264+36+44
=(156+44)+(264+36)
=200+300
=500
④346-69+54-31
=346+54-(69+31)
=400-100
=300
①987-(287+135)
=987-287-135
=700-135
=565
②487-139-61-287
=487-287-(139+61)
=200-200
=0
③156+264+36+44
=(156+44)+(264+36)
=200+300
=500
④346-69+54-31
=346+54-(69+31)
=400-100
=300
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