我很胖。你很瘦。可以说:
A:You're fat. I'm thin.
B:I'm fat. You're thin.
—I will have an important test tomorrow. I feel stressed now.—__________ and believe youself. You will pass it.
在某次体育考试中,某班参加仰卧起坐测试的一组女生(每组8人)测试成绩如下:44,45,42,48,46,47,45.则这组数据的极差为____.
4平方米=____平方分米
8平方米30平方分米=____平方分米
307平方厘米=____平方分米____平方厘米.