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How to do the quadratic root of the math problem in the second day of junior high school
1, simplified √3-√3( 1-√3)=√3-√3+3=3.

So choose one

2. Simplify (√x+√y)? +(√x-√y)? =2x+2y

3. Calculate √9-4√ 1/2+√8.

=3-2√+4√2

=3+2√2

4、a? b-b? a=ab(a-b)

=(3+2√2)(3-2√2)(3+2√2-3+2√2)

=(9-8)4√2

=4√2

Step 5 simplify

Original formula =a+2√a-a

=2√a

6、x? -2xy+y?

=(x-y)?

=(√7+√5)/2-(√7-√5)/2?

=7