X + Y = 14 (1)
XY=45 (2)
Y = 14 - X 带入(2)得: X(14 - X) = 45 (3)
解(3)得: X = 9 或 5
将两个X 值带入(1)得: Y = 5 或 9
当X = 5 时,Y = 9
当X = 9 时,Y = 5
X + Y = 14 (1)
XY=45 (2)
Y = 14 - X 带入(2)得: X(14 - X) = 45 (3)
解(3)得: X = 9 或 5
将两个X 值带入(1)得: Y = 5 或 9
当X = 5 时,Y = 9
当X = 9 时,Y = 5