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SY_Math-Science_008 (a*x^3+b*x^2+c*x+d=0) Express the solution where d=0. Show the conditions and the two solutions if the solution is only 2 different real solutions. Exprimer la solution lorsque d=0. Montrez également les condition.
Mathematics and Science by “ 『脱・下位層人間』=『理数系人間』”
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2022/6/4
第8回 式の解とその数 -2
x についての方程式
ax^3+bx^2+cx+d=0
について、次の各問に答えよ。
(ただし、a,b,c,d は実数の定数とする。)
(また、解は複素数の範囲で考えるものとする。)
(1) a=0 のときの解を、b,c,d を用いて表せ。また、解が2つの異なる実数解だけになるときの、b,c,d の条件と2解を示せ。
(2) d=0 のときの解を、a,b,c を用いて表せ。また、解が2つの異なる実数解だけになるときの、a,b,c の条件と2解を示せ。
(3) a=d,b=c のときの解を a,b,c,d を用いて表せ。 また、解が2つの異なる実数解だけになるときの a,b の条件と2解を示せ。
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