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Mathematics radical number of the second day of junior high school
When we remove absolute numbers, we should take into account the size inside the numbers.

Like /x-2/, x= 1, if the absolute number is directly removed, the result should be 1-2=- 1, which is different from /x-2/ = 1.

Generally, when we have an unknown number, we must first judge the size of the value, x-2 < 0, so /x-2/ =-(x-2)= 1.