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Rezolvati ecuatiile:420-(458-1000:X)+24*7=180 |||||| x:[(921-639):6-39]=9 |||||| *=inmultire; ||||| X=necunoscuta;          DAU MAGNIFICA COROANA


Răspuns :

420-(458-1000:X)+24*7=180420-(458-1000:x)=180-24*7=12
458-1000:x=420-12=408
1000:x=458-408=50
x=1000:50
x=20