運算式 30: "t" Subscript, 1 , Baseline equals StartFraction, "a" Subscript, 1 , Baseline "M" Subscript, 1 , Baseline minus "a" Subscript, 2 , Baseline "B" Subscript, 2 , Baseline minus "a" Subscript, 1 , Baseline "B" Subscript, 1 , Baseline plus "a" Subscript, 2 , Baseline "M" Subscript, 2 , Baseline Over "a" Subscript, 1 , Baseline "b" Subscript, 1 , Baseline plus "a" Subscript, 2 , Baseline "b" Subscript, 2 , Baseline , EndFractiont1=a1M1−a2B2−a1B1+a2M2a1b1+a2b2
