urgent ex 3
ofer coroana
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Răspuns:
a+3+a+a=9
3a=9-3
3a=6
a=6:3
a=2
22+23+22+22=89
y+y+3=9
2y=9-3
2y=6
y=6:2
y=3
33+33+33=99
Răspuns:
Explicație pas cu pas:
a)
20 + a + 10a + 3 + 10a + a + 10a + a = 89
23 + 33a = 89
33a = 89 - 23 = 66
a = 66 : 33 = 2
22 + 23 + 22 + 22 = 89
b)
30 + y + 10y + y + 10y + 3 = 99
33 + 22y = 99
22y = 99 - 33 = 66
y = 66 : 22 = 3
33 + 33 + 33 = 99