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2つの等しくない実数根は(-2)^2-4(a-8)=36-4a0 a<9 x1が3より大きい、x2が1より小さい、関数の開口部が上 f(1)=1-2+a-8=a-9<0 f(3)=9-2*3+a-8=a-5<0 だからa<5
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