The problem of points 20 helps, big brothers, big sisters, 20

It's best to buy the same memory as before, and if you don't know the memory model, find out the configuration list when you buy the machine. In this way, the two memories are not prone to problems.

Install XP just to buy a D version of the second version of the XP, to know which one is good, I recommend Shanghai **.

You don't need a 98 boot disk, find an XP installation disk, choose to boot directly from the disc, and go directly to the XP installation, if you want to completely delete the things of the C disk, choose to delete the C disk partition and then reinstall the XP. This is no different from installing XP directly.

Memory is supposed to be increased.

You can install XP directly under 98, and there is no special problem, but it feels like it is not as pleasant and reliable as it can be installed.

If 98 is deleted, you need to consider whether your XP is a self-booting disc or has a corresponding boot disk, otherwise it will be quite troublesome.

The memory module is more than 256, and if the machine is fast enough, 512 is even better.

The second floor is not entirely true!

98 upgrade XP, XP installation disc will be formatted C disk, may be changed from FAT32 to NTFS format, the only difference is: upgrade installation does not need to install drivers, direct installation to install drivers (motherboard drivers, graphics drivers, sound card drivers, etc.).

The memory should be the same as the original.

XP memory should not be lower than 256M, otherwise the machine will be slow!

1,Put the XP installation disc into the optical drive,Select the installation system,It's best to copy a CDK down first,Otherwise。。。

2,The system will prompt whether to upgrade the system,If you don't want to keep 98,Choose a fresh installation,But general piracy doesn't seem to be able to upgrade。

3. The machine will automatically restart after reading the required files.

4,After entering the installation interface,If you want to keep the original 98 system, don't format the 98 system disk,Otherwise, it will be removed。 If you keep it, the two systems should not be installed under the same disk, otherwise one system may not be used.

5, the rest is to click the next step, then you need CDK.

6. After installing the system, install the driver handle of other hardware.

Upgrade the installation directly with the disc.

Under 98, put in the XP disc, select the upgrade installation after automatic running, and your previous programs and files will not be lost.

Delete under DOS.

128 will slow down the system. Generally, 256 is fine, if you want to use 512 at a high point.

You can buy a pirated XP CD, put it directly into the CD-ROM drive, and then upgrade to XP!

You don't have to reinstall the original programs, if you want to re-install XP, you have to reinstall the previous programs, such as: office, etc., so the upgrade is also good! Hehe! The main thing is to save trouble!

The memory is not expensive, but it must be genuine, by the way, depending on what your memory module turned out to be, then it can be compatible! If you buy Samsung's, the DDR400 512M is only 300 yuan.

Upstairs correct, add that if your computer's memory is less than 64M, you can't install WinXP, in addition, sometimes the machine with too low clock speed will crash during installation.

Original = lim(x-> 2-1 x) 30*(3-2 x) 20 (2+1 x) 50] (divided into towns and towns Sakura denominator Lu rot with the same division x 50) =2-0) 30*(3-0) 20 (2+0) 50 ( Yusicong lim(x-> 1 x)=0) =2 30*3 20 2 50 =3 20 2 20 =(3 2) 20.

1. The most commonly used solution to this problem is the differential method;

2. Variable substitution method can also be used;

3. Blindness is the same method in China, and it is considered to be two different methods;

4. Similar problems are completely the same withering method in the middle grinding and defeating paper, and they will be rendered into completely different methods, and there are countless examples of this. For example:

a. The substitution of variables in the integral is rendered into the first and second categories, but in fact, there is no such distinction in the world;

b. When deriving binary and ternary implicit functions, they are rendered as formula methods and derivative methods, which are actually exactly the same methods.

For the specific solution, see the following figure

The first one puts x into dx.

The second puts cosx into dx.

Figure 1, Question 1:

With the formula of product sum difference:

f(x)=(1/2)[cos(x+x-a) +cos(x-x+a)] 1/2)cosa

1/2)cos(2x-a) +1/2)cosa - 1/2)cosa

1/2)cos(2x-a)

t=2π/2=π

0 The maximum value is 1 2