1, the cubic summation formula is a? +b？ =(a+b)(a？ -ab+b？ )。

2. The cubic difference formula is a? -B? =(a-b)(a2+ab+b2).

First of all, about the cubic sum formula.

Cubic sum formulas are sometimes used in mathematical operations. Its literal expression is: the sum of two numbers, multiplied by the difference between their sum of squares and their products, is equal to the cubic sum of these two numbers. Cubic difference formula and cubic sum formula * * * are called complete cubic formula.

Second, about the cubic difference formula

The literal expression of the cubic difference formula is: the sum of squares of two numbers plus the product of two numbers and then multiplied by the difference of two numbers, the product is equal to the cubic difference of two numbers.

Cubic difference formula is one of the commonly used formulas in mathematics, which plays an important role in high school mathematics and mathematics research, and is often used even in advanced mathematics and calculus.

Transformation relation:

1, cubic decimeter: 1 cubic decimeter = 0.005438+0 cubic meter.

2. Cubic centimeter: 1 cubic centimeter =0.000 00 1 cubic meter.

3. Square, male: 1 square (male) = 1 m3.

4. Cubic feet: 1 cubic feet = 1 307.8 cubic meters.

5. Cubic feet: 1 cubic feet =0.037 0 cubic meters.

6. Cubic yard: 1 cubic yard =0.764 6 cubic meters.

7. Cubic feet: 1 cubic feet =0.028 3 17 cubic meters.