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Afla numarul necunoscut folosind metoda mersului invers

Calculele:C-34243+22222-13432=28805
Altul:9572-d+12200-8324=5000

Urgent ofer coroana si 50 pct !!!


Răspuns :

Răspuns:

C-34243+22222-13432=28805

C-34243+22222=28805+13432

C-34243=42237-22222

C=20015+34243

C=54258

9572-d+12200-8324=5000

9572-d+12200=5000+8324

9572-d=13324-12200

d=9572-1124

d=8448