苏教版 乘法分配律
乘法分配律,主讲:王老师,(4+2)×25,=6×25 =150(人),4×25+2×25,=100+50 =150(人),(42)×25,4×252×25,每组里4人负责挖坑、种树,有2人负责抬水、浇树。,这叫做乘法分配律。,(4+2)×25,4×25,25 ×(4+2),25×4,(a+b) ×ca×c+b×c,用字母表示为:,2×25,+,25×2,+,(25+50)×4= _×4+ _×4 125 ×(4+8)= 125× _ + 125×_ _×(_+_)=187×6+6×113 7×48+7×52=(_+_)×_,52,48,7,(40+8)×25=40×25+8 ( ),×,(40+8)×25 =40×25+8×25 =1000+200 =1200,由此判断题中说法不正确,乘法分配律,