2019~2022年下期英语周报七年级32期答案

16.①②④易知∫(x)的定义域为[0,+∞),所以①为真命题因为∫(x)为增函数所以∫(x)的最小值为f(0)=-1,所以②为真命题,③为假命题因为f(0)<0,f(1)>0,所以∫(x)存在零点x∈(0,1),令x=sina,则f(sina)=0,所以④为真命题

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