求方程的解的过程叫做。
的分子加上4,要使分数的大小不变,分母应( )。
是;个
等于1。
50.6÷46=
Hello, my name is Kitty. I am a student. My favourite season is spring, because I like flying kites. It is good for our health. I have a good friend. Her name is Maria. She likes winter best. She can make a snowman in winter. So we fly kites in spring and make a snowman in winter together.
,宽扩大到原来的3倍,要使体积扩大到原来的3倍,那么高( )。

和
通分.
和
通分.