表达式1: negative 19 left parenthesis, 6 "x" Subscript, 1 , Baseline minus 4 , right parenthesis squared plus 6 left parenthesis, 6 "x" Subscript, 1 , Baseline minus 3 , right parenthesis squared tilde StartFraction, "a" Over 9 , EndFraction "x" squared plus StartFraction, "b" Over 9 , EndFraction "x" Subscript, 1 , Baseline plus StartFraction, "c" Over 9 , EndFraction 有回归。要查看统计数据，按Tab键。−196x1−42+66x1−32~a9x21+b9x1+c9
1
表达式2: "x" Subscript, 1 , Baseline equals left bracket, 1 , 2 , 3 , 4 , right bracketx1=1,2,3,4
