We wondered __________ this afternoon.
A:whether we would have a meeting
B:where would we have a meeting
C:whether we will have a meeting
D:that we would have a meeting
已知:①
②核磁共振氢谱显示C的分子中含有4种不同化学环境的氢原子,且峰面积之比为3:2:2:1.
③F是酯类化合物,分子中苯环上的一溴代物只有两种.
已知坐标平面内的三个点A(1,3),B(3,1),O(0,0),求△ABO的面积.
(Ⅰ)求m的值
(Ⅱ)当x>1时,证明f(x)+(2+ 1e )x>2x﹣2
(Ⅲ)如果s,t,r满足|s﹣r|≤|t﹣r|,那么称s比t更靠近r,当a≥2且x≥1时,试比较 ex 和ex﹣1+a哪个更靠近f(x),并说明理由.