表达式4: "Q" Subscript, "e" "q" , Baseline left parenthesis, "l" , "m" , "n" , right parenthesis equals StartFraction, negative "m" plus StartRoot, "m" squared minus 4 "l" times "n" , EndRoot Over 2 "l" , EndFractionQeql,m,n=−m+m2−4l·n2l
4
表达式5: "X" equals "Q" Subscript, "e" "q" , Baseline left parenthesis, 2 , 2 "b" , left parenthesis, 2 "a" squared plus 2 "a" "b" minus 2 "b" "t" minus "t" squared , right parenthesis , right parenthesisX=Qeq2,2b,2a2+2ab−2bt−t2
5
表达式6: "F" Subscript, "e" "x" "t" "e" "n" "s" "i" "o" "n" , Baseline equals 0.8 5 6 3Fextension=0.8563
