已知504÷7=72,请写出下列各式的答案:
50.4÷7=____
504÷0.7=____
0.504÷7=____
5.04÷0.7=____
—— It's said that scientists have ________ a way to deal with the disease(疾病)——Really? That's great!
一对表现正常的夫妇,生了一个白化病的女孩,他们再生一个白化病的男孩的可能性占()
已知,在△ABC中,∠A=45°,AC=2,AB=3+1,则边BC的长为____ .