.我们定义:在分式中,对于只含有一个字母的分式,当分子的次数大于或等于分母的次数时,我们称之为“假分式”;当分子的次数小于分母的次数时,我们称之为“真分式”.如:
,
这样的分式就是假分式;再如:
,
这样的分式就是真分式.类似的,假分式也可以化为带分式(即:整式与真分式的和的形式).如:
;再如:
. 解决下列问题:
是分式(填“真分式”或“假分式”);
化为带分式的形式(写出过程);
的值为整数,那么x的整数值为.
B .
C .
D .
. 
=(x﹣
)2
C . x2﹣2x+4=(x﹣2)2
D . x2﹣4=(x+4)(x﹣4)
—Dale. He wrote Alex.
Many of us buy things from vending machines(自动售货机). Most machines sell food and drinks. But this one is special. It sells novels.
You can see the special vending machines in France. You can find them easily in many places such as airports, train stations and shopping malls.
The vending machines sell lots of novels. The novels are not the same. Some are long and some are short.
It's easy to get a novel from the vending machines. First, you need to choose your reading time: 1 minute, 3 minutes or 5 minutes. Then, a piece of paper will come out of the vending machines. Finally, take away the paper and it is the novel you want.
Lots of young people like the special vending machines. They say the novels from the vending machines can help them pass the time. They don't want to use their mobile phones to read novels. They prefer to read novels on paper.
|
口罩类型 |
①普通16层纱布口罩 |
②单层无纺布口罩 |
③N95专业口罩 |
|
过滤孔径 |
0.01厘米左右 |
0.01毫米左右 |
0.1微米左右 |