25+36= 14+29= 19+25=43+ 18=2 1+29=56+36=49+ 12=34+ 18=24+ 17=22+29=73+ 18=27+39=73+ 1 4=55+ 17=36+27=3 4+58=53+29=63+28=36+ 17=53+ 16=36+25=73+24=56+27=22+28=42+37=43+25=73+ 14=36+27=22+ 18=40+ 17=68+29=47+28=67+29=4。

Expand knowledge:

Addition (usually indicated by the plus sign "+") is one of the four basic arithmetic operations, and the others are subtraction, multiplication and division. For example, in the picture below, * * * has a combination of three apples and two apples, and * * * counts as five apples. This observation is equivalent to the mathematical expression 3+2 equals 5, that is, 3 plus 2 equals 5.

In addition to calculating fruits, you can also calculate other physical objects. Using system generalization, addition can also be defined on more abstract quantities, such as integers, rational numbers, real numbers and complex numbers, and other abstract objects, such as vectors and matrices.

In arithmetic, the addition rules involving fractions and negative numbers are designed. Addition has several important properties. It is interchangeable, which means that the order is not important, it is interrelated, which means that when more than two numbers are added, the order in which the addition is performed is not important. Repeatedly adding 1 is the same as counting; Adding 0 will not change the result. Addition also follows related operations such as subtraction and multiplication.

Addition is one of the simplest digital tasks. The most basic addition: 1+ 1 five-month-old babies and even other animal species can be counted. In primary education, students are taught to calculate the superposition of decimal numbers, starting with one digit, and gradually solving the more difficult number calculation.