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Răspuns:
a)x=43,75
y=30,96
x+y=74,71
x-y=12,79
b)x=18,34
y=9,95
x+y=28,29
x-y=8,39
c)x=45,4
y=18,1
x+y=63,5
x-y=27,3
d)x=10,851
y=2,83
x+y=13,681
x-y=8,020
e)x=20,90
y=3,25
x+y=24,15
x-y=17,65