题目

It was Saturday again. Grace and Karen disliked Saturdays. That was another thing the twins had in common. They shared the same clothes and tied their hair in the same manner. In fact, it was hard for their classmates and teachers to tell them apart sometimes.Unlike their classmates, they had to get up early at seven every Saturday to prepare for their lessons. Grace had to attend the art lesson and Karen had to attend her ballet lesson. “How I wish I could do something different today,” said the twins with one voice. All at once, an idea came to Grace and Karen at the same time. “How wo若直角三角形两直角边长的比为3：4，斜边长为10cm，则两直角边长分别为 和 ．