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matlab二元一次多项式拟合?x=(29.32,30.46,32.23,33.55,35.53,37.19,38.67),y=(1.839,1.819,1.811,1.770,1.750,1.738,1.724),z=(84.93,71.65,62.70,41.67,31.15,23.20,19.20),求lgz=a+b*x+c*y中的系数a、b、c?
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