789减298简便计算
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789减298简便计算789减298简便计算789减298简便计算789-300+2=489+2=491=789-(300-2)=789-300+2=489+2=491789-298=789—(300
789减298简便计算
789减298简便计算
789减298简便计算
789-300+2
=489+2
=491
=789-(300-2)
=789-300+2
=489+2
=491
789-298
=789—(300—2)
=789-300+2
=489+2
=491
789-298
=800-1-(300-2)
=800-300-1+2
=500+1
=501