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a fost răspuns

(?-124)-216=323
563+(?+156)=683
(?-215)+326)=598
785-(?-148)=273
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Răspuns :

1. 323+216+124=663 2.
(?-124)-216=323 
(x-124)-216=323 
(x-124)=323+216
x-124=539
x=539+124
x=663

563+(?+156)=683
563+(x+156)=683
(x+156)=683-563
x+156=120
x=120-156
x= - 36

(?-215)+326=598
(x-215)+326=598
(x-215)=598-326
x-215=272
x=272+215
x=487

785-(?-148)=273
785-(x-148)=273
(x-148)=785-273
x-148=512
x=512+148
x=660