128+56+372+244怎样简便怎样算
128+56+372+244
=128+372+56+244
=(128+372)+(56+244)
=500+300
=800
128+56+372+244
=(128+372)+(56+244) (加法的交换律、结合律,凑整法)
=500+300
=800
128+56+372+244
=(128+372)+(56+244)
=500+300
=800
128+56+372+244怎样简便怎样算
=(128+372)+(56+244)
=500+300
=800