53×65+25×25 怎样简算?

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53×65+25×25 怎样简算?
53×65+25×25 怎样简算?

53×65+25×25 怎样简算?
53×65+25×25
=28×65+25×65+25×25
=14×130+25×(65+25)
=1820+25×90
=1820+2250
=4070

53×65+25×25
=28×65+25×65+25×25
=14×130+25×90
=1820+2250
=4070

53×65+25×25 =(50+3)X(13X5)+25X25