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Why is mathematics as white as printed lines and as black?
The toner in the ink cartridge is uneven. Take it out and shake it.

The problem with the ink cartridge is that the toner is less and unevenly distributed, resulting in a dark and irregular copy background. You can take the ink cartridge apart and have a look. If it is missing, remember to add it in time. If you have other problems, you'd better find a master to solve them, don't touch them yourself, and don't trust people who charge for maintenance easily.

Principle: Send printing instructions to the printer. At present, it is sent to the computer through the network, and the printer connected to the computer prints.