a,b∈R,若a+2i与2-6i(其中i为虚数单位)互为共轭复数,则a+b=_____。
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一个圆锥的高不变,底面半径比原来减少25%,则原来的体积比现在多()/()
已知集合A={1,m},B={2,3},A ∩B={2},则A∪B=_____。
秋冬之际,由于天气逐渐变冷,牧场上的草以固定的速度在减少。已知一个牧场上的草可供45头牛吃4天或可供25头牛吃6天。照此计算,这个牧场可供几头牛吃10天?
I’ve already told you that I′ m going to buy it, ____________
A. however much it costs
B. how much does it cost
C. however does it cost much
D. no matter how it costs