Generally divided into these four situations.
1, a negative number multiplied by an algebraic expression.
Such as: -2(6-x)=- 12+2x
-2(x-6)=-2x+ 12
2. Absolute value
/a- 1/+/a+3/
When a is greater than or equal to 1
The original formula =a- 1+a+3=2a+2.
Others can try it themselves.
3. Root number
It is greater than 0. Absolutely.
4, square, 4, 6. ...
Also greater than 0
Pure original, hope to adopt, thank you.
Although the head of the decimal point is small, I know that the decimal point is not small. For example, 3.80 yuan, without