从前,有一个由数字组成的家庭,这个家庭里面有4个成员,分别是:1、2、0、X,他们和睦相处,但有时也会发生一些小争吵。一天,他们为谁的功劳最大而争吵起来,0说:“在什么地方都用到我,比如说:一千万,一亿等这样的数,必须用我来表示。1说:”如果没有我1,就算再多0,也还是0,所以说我的功劳最大。“x说:”你们的功劳都不如我大,一些方程要用到我,如果只凭你们是解不出方程来的。“这时,2语重心长地说:”你们都很重要,缺一不 Once upon a time there was a family of numbers with four members in the family: 1,2,0, X. They lived in harmony, but sometimes minor quarrels occurred. One day, they quarrel for whom the greatest contribution, 0 said: “I use it everywhere, for example: a few million, a hundred million, and so the number must be used to express I. 1 said: ” If you do not have me 1, even if you add 0, you will still be 0, so my credit is the greatest. “x said: ” Your credit is not as good as me, some of the equations to use me, if only you can not solve the equation. “At this time, 2 seriously: ” You are all important, one after another