百灵比迈克大两岁,可以说:( )
A:Bai Ling is 2 kg heavier than Mike.
B:Bai Ling is two years bigger than Mike.
C:Bai Ling is two years older than Mike.
①命题: ∃x∈R,sinx−cosx=2 ;
②函数f(x)=2x﹣x2有三个零点;
③对∀(x,y)∈{(x,y)|4x+3y﹣10=0},则x2+y2≥4.
④已知函数 f(x)=x+1x ,若△ABC中,角C是钝角,那么f(sinA)>f(cosB)
其中所有真命题的序号是____.
3003003的最高位是( )位
观察如图,回答下题.
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