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Monotonicity of mathematical function in senior one.
Solve this kind of problem: derivative is not applied for the time being. So honestly follow the concept.

Let's judge y 1=(x+ 1) first. Monotonicity and monotone interval can be simplified to get x to all real numbers.

When X=- 1, it is the symmetry axis of the original equation.

So according to the function image x

Y2= 1-x (x is not equal to 1) is always a decreasing function.

By definition (same increase but different decrease)

Therefore, when x is greater than negative 1, it is a decreasing function.

The increasing function when x is less than negative 1.