вычисли удобным способом 21+97+79+205=(267+398)-67=712-(59+612)=. Created by lidamorozz. matematika-ru

вычисли удобным способом 21+97+79+205=(267+398)-67=712-(59+612)=...

inadia69 21+97+79+205=21+79+200+5+90+7=100+290+12=390+12=402
(267+398)-67=267-67+398=200+398=598

712-(59+612)=712-612-59=100-59=41

yliaks Выполняю по действиях:
1.   21+97+79+205= 402
1) 21 + 97 = 118
2) 118 + 79 =  197
3) 197 + 205 = 402

2.   (267+398)-67= 598
1) 267 + 398 = 665
2) 665 - 67 = 598

3.   712-(59+612)= 41
1) 59 + 612 = 671
2) 712 - 671 = 41

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