Răspuns :
1) (ax5)+4,8+0,061=15,389 (ax5)+4,861=15,389 ax5=15,389-4,861 ax5=10,528 a=10,528:5 a=2,1056 2)2x+3x=19,76 5x=19,76 x=19,76:5 x=3,952