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a fost răspuns

Gaseste numarul necunoscut
( 257 + 379 ) - a = 121
b + ( 267 + 348 ) = 916
c - (365 + 96) = 329
d - ( 848 - 426 ) = 379
2. La suma numerelor 254 , 92 si 131 adauga numarul 391.

Răspuns :

(257+379)-a=121
636-a=121
a=636-121
a=515
(257+379)-515=121
b+(267+348)=916
b+615=916
b=916-615
b=301
301+(267+348)=916
c-(365+96)=329
c-461=329
c=329+461
c=790
790-(365+96)=329
d-(848-426)=379
d-422=379
d=379+422
d=801
801-(848-426)=379
(254+92+131)+391=868