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Calculeaza
(520+279)-409=
(911-775)+309=
(485+376)-(435+186)=
(495+209)+(800-502)=
(852-574)+(609-565)=
(974-286)-(541-374)=


Răspuns :

1) 390
2) 445
3)240
4)1002
5)332
6)521
(520+279)-409=390
(911-775)+309=445
(485+376)-(435+186)=240
(495+209)+(800-502)=1002
(852-574)+(609-565)=322
(974-286)-(541-374)=521
Sper că te-am ajutat