1x 2+3 x4+5x 6+7x 8 = 100

Operation symbol:

Mathematically, different operations can be represented by different symbols.

The origin of mathematical operation symbols;

The initial symbols are "+"and "-". More than 500 years ago, German mathematician Weidemann added a vertical bar to the horizontal line to indicate the increase. On the contrary, removing a vertical bar from the plus sign means reducing. However, these two symbols are generally recognized, starting from the formal application of them by the Dutch mathematician Braun Ik 15 14.

There is also a saying that "+"comes from the Latin "et". /kloc-In the 6th century, Italian scientist Nicolo Tartaglia used the first letter of the Italian word "pi" to mean "jia", and the word "μ" for grass finally became "+". "-"evolved from Latin "minus".

It is also said that wine merchants use "-"to indicate how much wine is sold in barrels. The new wine is poured into the barrel, and a vertical line is added to the "-",indicating that the original line has been erased, thus becoming a "+". ?