12,13,14,

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12,13,14,12,13,14, 12,13,14,12:x+y-3=0

12,13,14,
12,13,14,

12,13,14,
12:x +y -3=0

12+13+14-14+12+14-12 11,12,13,14, 11,12,13,14, 求12 13 14 求12,13,14, 3 12,13,14, 12 13 14 15 12,13,14选择题 12 13 14 11,12,13,14, 12,13,14, 11,12,13,14, 12、13、14题, 11,12,13,14, 11,12,13,14, 11,12,13,14 12,13,14, 11 12 13 14