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Simonacampeanu2
a fost răspuns

calculati sumele,grupand convenabil termenii;400+265+100;350+50+134;120+60+440;

 

     

Răspuns :

400+265+100=(400+100)+265=500+265=765
350+50+134=(350+50)+134=400+134=534
120+60+440=120+(60+440)=120+500=620