表达式12: "l" Subscript, 2 , Baseline equals StartFraction, negative "f" left parenthesis, "r" , right parenthesis negative "f" left parenthesis, "q" , right parenthesis Over "r" negative "q" , EndFractionl2=−fr−fqr−q
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point
对学生隐藏该文件夹。
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表达式14: left parenthesis, "s" , "f" left parenthesis, "s" , right parenthesis , right parenthesiss,fs
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表达式15: left parenthesis, "s" , negative "f" left parenthesis, "s" , right parenthesis , right parenthesiss,−fs
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表达式16: left parenthesis, "p" , "f" left parenthesis, "p" , right parenthesis , right parenthesisp,fp
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表达式17: left parenthesis, "q" , "f" left parenthesis, "q" , right parenthesis , right parenthesisq,fq
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表达式18: left parenthesis, "r" , "f" left parenthesis, "r" , right parenthesis , right parenthesisr,fr
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表达式19: left parenthesis, "r" , negative "f" left parenthesis, "r" , right parenthesis , right parenthesisr,−fr
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line
对学生隐藏该文件夹。
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表达式21: "y" equals "l" Subscript, 2 , Baseline left parenthesis, "x" negative "r" , right parenthesis negative "f" left parenthesis, "r" , right parenthesisy=l2x−r−fr
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表达式22: "y" equals "l" Subscript, 1 , Baseline left parenthesis, "x" minus "p" , right parenthesis plus "f" left parenthesis, "p" , right parenthesisy=l1x−p+fp
