運算式 9: "t" Subscript, "e" , Baseline equals min left parenthesis, "t" Subscript, "r" , Baseline , "t" Subscript, "m" "a" "x" , Baseline minus "t" , right parenthesiste=mintr,tmax−t
9
運算式 10: "R" equals StartFraction, left parenthesis, "r" Subscript, "r" , Baseline times "t" Subscript, "e" , Baseline plus "r" times "t" , right parenthesis Over 2 , EndFractionR=rr·te+r·t2
10
運算式 11: "S" equals 20 times "r" equals 20S=20·r
equals=
2020
11
運算式 12: "F" equals "S" plus "R" 有圖檔。 要進行圖形閱讀，請按 Alt + T 鍵。F=S+R
