Răspuns:
574+a-268=449
=> 574+a=449+268
574+a=717
a=717-574
a=143
a. 2×a= 2×143=286
b. 800-5×a= 800-5×143=800-715=85
c. 965-6×a+278=965-6×143+278=
=965-858+278=107+278=385
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Răspuns:
574+a-268=449
=> 574+a=449+268
574+a=717
a=717-574
a=143
a. 2×a= 2×143=286
b. 800-5×a= 800-5×143=800-715=85
c. 965-6×a+278=965-6×143+278=
=965-858+278=107+278=385