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A. AFLA NUMARUL X DIN EXERCITIILE DE MAI JOS (4536- X) -3215=509 B.3786-(X+927)+1250=3503 C.(7843-X)-5784=3059 D.4398-(X+397)=2574

Răspuns :

(4536-x)-3215=509
4536-x=509+3215
4536-x=3724
x=4536-3724
x=812

3786-(x+927)+1250=3503
3786-(x+927)=3503-1250
3786-(x+927)=2253
x+927=3786-2253
x+927=1533
x=1533-927
x=606

(7843-x)-5784=3059
7843-x=3059+5784
7843-x=8843
nu este bun ex

4398-(x+397)=2574
x+397=4398-2574
x-397=1824
x=1824-397
x=1427