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Find the mathematical answer: 2.2.2 = 6; 3.3.3=6; 4.4.4=6; 5.5.5=6; 6.6.6=6; 7.7
Three 2-column formulas are equal to 6, such as: 2+2+2 = 6; 2×2+2=6。

Three 3-column formulas are equal to 6, for example, 3×3-3=6.

Three four-column formulas are equal to 6, such as: 4+4-√4=6.

Three five-column formulas are equal to 6, for example, 5+(5÷5)=6.

Three six-column formulas are equal to 6, such as 6+6-6=6.

Three 7-column formulas are equal to 6, for example, 7-7÷7=6.

Three 8-column formulas are equal to 6, such as (? √8)+(? √8)+(? √8)=6。

Three 9-column formulas are equal to 6, such as 9 \u (? √9)+(? √9)=6。

Extended data:

Addition: the operation of combining two numbers into one number.

Subtraction: when two addends and one of them are known, the operation of finding the other addend.

Multiplication: the operation of finding the product of two numbers.

(1) Multiplying a number with an integer is a simple operation, and you can find the sum of several identical addends.

(2) Multiplying a number by a decimal is to find a few tenths, a few percent and a few thousandths of this number.

(3) A number multiplied by a fraction is a fraction of this number.

Division: the operation of finding another factor by knowing the product of two factors and one of them.

Operation sequence of mixed operation:

When calculating at the same level, calculate from left to right in turn;

Two-stage operation, first multiply and then divide, then add and subtract.

When there are brackets, count the inside of brackets first, and then count the outside of brackets;

When there are multiple brackets, count the brackets first, then the brackets inside, then the braces inside, and finally the brackets outside.

If there is a power, calculate the power first.

When performing mixed operations, the numbers in parentheses are calculated first, and the parentheses are from small to large. If there is a power, calculate the power first, and then from high to low.