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(b+13)×100-4200=5800. află numarul necunoscut

Răspuns :

(b+13)×100-4200=5800
(b+13)×100=5800+4200
(b+13)×100=10000
b+13=10000:100
b+13=100
b=100-13
b=87
(b+13)x100-4200=5800
(b+13)x100=5800+4200
(b+13)x100=10000
b+13=10000:100
b+13=100
b=100-13
b=77