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C:=
D:≥
如图,在平面直角坐标系第一象限内,直线y=x与直线y=2x的内部作等腰Rt△ABC,是∠ABC=90°,边BC∥x轴,AB∥y轴,点A(1,1)在直线y=x上,点C在直线y=2x上:CB的延长线交直线y=x于点A1,作等腰Rt△A1B1C1,是∠A1B1C1=90°,B1C1∥x轴,A1B1∥y轴,点C1在直线y=2x上…按此规律,则等腰Rt△AnBnCn的腰长为____.
— He's never advised to achieve a balance between his job and hobbies, ________? — _______. His parents and teachers often offer him advice.
日本的国花是( )
如图,已知AD是△ABC的中线,AE=EF=FC,下面给出三个关系式:①AG:AD=1:2; ②GE:BE=1:3 ;③BE:BG=4:3;其中正确的是( )