设a,b∈(0,+∞)且=1，求证：对于任何n∈N*,有(a+b)n-an-bn≥22n-2n+1成立.
Tom and Jane have (相似)tastes in music．
I’ll help you _____. A. as much as I can B. as possible as I canC. as many as possibleD. as many as I can
The way he suggests to us doesn’t make______ A. difference B. opinions C. use D. sense
The news reporters hurried to the airport, only ______the film stars had left. A .to tell B .to be told C .telling D .told
民族区域自治制度和基层群众自治制度都是中国特色社会主义民主政治的重要形式。这两项制度中的“自治”的共同点在于 A ．都是解决民族问题的基
某化合物6.4 g在氧气中完全燃烧，只生成8.8 g CO2和7.2 g H2O。下列说法正确的是 A．该化合物仅含碳、氢两种元素 B．该化合物中碳、氢原子个数比为1：4 C
下列化学方程式书写正确且符合题意的是 A．稀盐酸除铁锈 Fe2O3 ＋ 4HCl = 2FeCl2 ＋ 2H2O B．实验室用大理石制取二氧化碳 CaCO3 ＋ H2SO4 ＝ CaSO4 ＋ H2O ＋ CO2 C
的图象大致是
∴应选C.