4)39+2=41 64-7=57 60+23=83 50-21=39
390+20=410 640-70=570 560+23=583 750-21=739
4ә)560см+23см=583см 750см-21см=739 390+20=410
560см+230см=790см 750см-210см=540 390+200=590
5а)195-129=66
5ә)187+467+234=888 1000-(234+328)=438
