表达式86: "y" equals 2cosine left parenthesis, 0.2 left parenthesis, "x" minus "C" , right parenthesis , right parenthesis plus 85 left brace, negative 200 less than "x" less than 200 , right bracey=2cos0.2x−C+85−200<x<200
86
表达式87: "C" equals 2.2C=2.2
87
plants
对学生隐藏该文件夹。
88
bubbles
对学生隐藏该文件夹。
106
表达式107: ( "x" minus 40 ) squared plus ( "y" minus 29 ) squared equals 40(x−40)2+(y−29)2=40
107
表达式108: ( "x" minus 49 ) squared plus ( "y" minus 40 ) squared equals 20(x−49)2+(y−40)2=20
108
表达式109: ( "x" minus 53.3 ) squared plus ( "y" minus 49.9 ) squared equals 10(x−53.3)2+(y−49.9)2=10
