Solution:1+2+3+4+5+6+……+99+100 = (1+100) × (100 ÷ zhi2) = 2+99= 10 1, 3+98 =10/,4+97 = 10 1 … Hui … 50+51.

* * * Answer 100÷2=50 times 10 1, so answer 1+2+3+4+...+ Solution: 1+ Know 2+3+4+. 2+99 = 10 1, 3+98 =10/,4+97 = 10 1 … Hui … 50+51.

* * * The answer is100 ÷ 2 = 5010/kloc-0, so1+2+3+4+...+100 =10/.

=5050 100= 10 1×( 100÷2)=5050

Extended data

Simple calculation method:

Simple operations round up integers, exchange them first and then combine them; A number MINUS several numbers in a row is equal to the sum of the subtracted numbers; A number divided by several numbers in succession is equal to the product of this number divided.

Several numbers are multiplied and then added separately, and several numbers are multiplied and then subtracted separately. Give the same number and put the rest in brackets. More reduction, more increase, less increase, less decrease.