一个直角三角形周长是26cm,两条直角边长是8厘米和5.5cm,斜边长 厘米.
= :16= 填小数=9÷ =.
= ÷ = (填小数)
12÷48= :8== %
15÷ ==1: = ÷40= .
= ÷ 5÷17====.