Mathematics
Senior High
u<v ならば f(u) > f(v) が
成り立つとき、f(x)はその区間で
単調に減少する(ピンクの線)とありますが、f(x)が３次関数(２枚目の写真)のようになったとき、その区間で単調に減少しているとは言えなくないですか？
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