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简介:
(40+8)X25 125X(8+80) 36X(100+50)
=40X25+8X25 =125X8+125X80 =36X100+36X50
=1000+200 =1000+10000 =3600+1800
=1200 =11000 =5400
36X34+36X66 75X23+25X23 63X43+57X63
=36X(34+66) =23X(75+25) =63X(43+57)
=36X100 =23X100 =63X100
=3600 =2300 =6300