用四舍五入法对下列各数按要求取近似数．
①9.23456（精确到0.0001）；
②567899（精确到百位）．
解：①9.23456≈9.2346（精确到0.0001）；
②567899≈5.679×105（精确到百位）．
不等式9＞﹣3x的解集是____.
提示词：
1). a big house, parents, a happy life
2). build a Hope School, help poor children, go to school, get an education
3). give, old people's home, make their life better
4). travel, around the world, with family or friends
If I have a lot of money, I will
内的随机数a均匀地转化到
内的随机数b，则可实施的变换为