表达式18: "A" Subscript, "r" "e" "a" "l" , Baseline equals StartFraction, 4 "l" Over "b" , EndFraction plus "b" squaredAreal=4lb+b2
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表达式19: "f" left parenthesis, "b" , right parenthesis "n"fbn
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Ligninger
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表达式21: "S" Subscript, "i" "d" "e" "a" "r" "e" "a" "l" , Baseline equals "b" "h"Sideareal=bh
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表达式22: "B" Subscript, "u" "n" "d" "a" "r" "e" "a" "l" , Baseline equals "b" squaredBundareal=b2
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表达式23: "O" Subscript, "v" "e" "r" "f" "l" "a" "d" "e" , Baseline equals 4 "S" Subscript, "i" "d" "e" "a" "r" "e" "a" "l" , Baseline plus "B" Subscript, "u" "n" "d" "a" "r" "e" "a" "l" , BaselineOverflade=4Sideareal+Bundareal
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表达式24: "R" Subscript, "u" "m" "f" "a" "n" "g" , Baseline equals "h" "b" squaredRumfang=hb2
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Optimal bredde
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表达式26: "f" prime left parenthesis, "b" Subscript, "o" "p" "t" "i" "m" "a" "l" , Baseline , right parenthesisf′boptimal
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表达式27: StartFraction, 2 "b" Subscript, "o" "p" "t" "i" "m" "a" "l" , Baseline Over "n" , EndFraction minus StartFraction, 4 "l" Over "n" "b" squared , EndFraction2boptimaln−4lnb2optimal