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如图所示,在四边形ABCD中,∠BAD=90°,∠B=75°,∠ADC=135°,AB=AD= √2 ,E为BC中点,则AE+DE长为______ .
1年前
Professor White has written some short stories, but he is _____ for his plays.
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A human ______ can do some things better than a computer, for example, creating new ideas.
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在数列{an}中,a1=1,an+1= 2an/2+an (n∈N+),求a1,a2,a3并猜想数列{an}的通项公式;
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求由方程y=1-xe右上角y所确定的隐函数y=y(X)的导数dy/dx=( )
1年前