(15+24+80)x25
=119x25
=120x25-1x25
=30x4x25-25
=30x100-25
=3000-25
=2975
(15+24+80)x25是怎么简便计算
解：采用分配律，
原式=(15+24+80)x25
=15x25+24x25+80x25
=375+600+2000
=975+2000
=2975
(15+24+80)x25
=(40+80-1)x25
=40x25+80x25-25
=1000+2000-25
=2975
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