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821+397-(900-320:4)=​

Răspuns :

821 + 397 - ( 900 - 320 : 4 ) =

821 + 397 - ( 900 - 80 ) =

821 + 397 - 820 =

1218 - 820 = 398
821+397-(900-320:4)=​
821+397-(900-80)=
821+397-820=
1218-820= 398.