xy - cyfra dwy cyfrowa
x+y=6
wartość cyfry 10*x+yx + y = 6 100*x + 8*10 + y = 10*x + y + 260y = 6 - x100*x + 80 + 6 - x = 10*x + 6 - x + 26099x + 86 = 9x + 26690x = 266 - 8690x = 180x = 180 : 90x = 2y = 6 - x = 6 - 2 = 4
xy - 24
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xy - cyfra dwy cyfrowa
x+y=6
wartość cyfry 10*x+y
x + y = 6
100*x + 8*10 + y = 10*x + y + 260
y = 6 - x
100*x + 80 + 6 - x = 10*x + 6 - x + 260
99x + 86 = 9x + 266
90x = 266 - 86
90x = 180
x = 180 : 90
x = 2
y = 6 - x = 6 - 2 = 4
xy - 24