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Afla numarul necunoscut a+26X35=2407 b-31X148=1032 89X105-c=25X14 d-48X16=123X20

Răspuns :

a+26×35=2407
a+910=2407
a=2407-910=1497

b-31×148=1032
b-4588=1032
b=1032+4588=5620

89×105-c=25×14
9345-c=350
c=9345-350=8995

d-48×16=123×20
d-768=2460
d=2460+768=3228