Because it's this plus that that's equal to zero, and there's the minus sign that I forgot to write down.

因为这个加上这个等于零，这里我忘写了一个负号。

youdao

The results appear to be accurate to within plus or minus 9 years.

试验结果显示的最大误差为正负9年。

youdao

The rule is: If there is a plus somewhere, then there's a minus next to it and below it.

规则：如果有一个+号，右边和下边都是-号。

youdao

Then F is one minus one plus two, is equal to two.

那么F等于1减去1再加上2。

youdao

Then F is one minus one plus two, is equal to two.

那么F等于1减去1再加上2。

youdao