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[(840÷x)×2+(2800-1600)÷100]÷2=11

Răspuns :


(840:x) x 2+(2800-1600):100=22

(840:x) 2+1200:100=22

(840:x) x 2+12=22

(840:x) x 2=10

840:x=5

x=840:5=160

x=160

Am facut verificarea si sunt sigura 100 la 100 ca x=160