x？ +2x-3 > or = 0,

The crossover method regards x as 1.

Solving process thinking

(1) is x, that is, 1 (2) is -3. Cross multiply (3)(4) and (1)(2).

(1) times (3) equals the last number -3 times (2) and then times (4).

x？ +2x-3

1 -3

(3) 1 (4) 1

I hope you can remember that, generally speaking, some can be multiplied by some intersections, and some can't.

It is best to use the formula method. -b plus or minus the radical sign (b) in 2a? The probability of -4ac is rarely wrong unless you press the wrong button.

Solving process thinking

∫ X under the root sign? +2x-3

(x+3) (x- 1) > or = 0,

There are two situations.

∴ x- 1。 ≥0 x- 1。 ≤0. You don't have to write the idea of x ≥ 1 x≤ 1, but take the big x ≥ 1 greatly.

The idea that x+3≥0 x+3≤0 may not be written as x≥-3 x≤-3, and the smallest is x≥-3.

∴ It is concluded that -3 ≥ x≥ 1.

Unless you take the big one with the small one, there are still big ones with the small ones, small ones with the big ones, small ones with the big ones and small ones with the big ones.

Teach you the process and ideas. I hope you can learn well. I was no better than you before.

Study hard and you will learn well.

If you have the answer, you can't use it yourself. Who will give you the answer to the college entrance examination?

Start (a disease)