表达式4: "x" equals StartFraction, negative "C" Over "x" "A" plus "B" , EndFractionx=−CxA+B
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4
表达式5: "x" left parenthesis, "x" "A" plus "B" , right parenthesis equals negative "C"xxA+B=−C
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5
表达式6: "A" "x" squared plus "B" "x" plus "C" equals 0Ax2+Bx+C=0
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6
表达式7: "x" equals StartFraction, left parenthesis, negative "B" plus left bracket, 1 , negative 1 , right bracket StartRoot, "B" squared minus 4 "A" "C" , EndRoot , right parenthesis Over 2 "A" , EndFractionx=−B+1,−1B2−4AC2A