Math topics in junior high school. On the quadratic radical.

Multiply 1 and (1) up and down by (root number 3) to get (root number 3)/3.

(2) Multiply (root number 5) up and down to get (root number 10)/5.

2. (root number 20) times (1) to get 4 (root number 10)/20.

Simplification (root number 10)/5

(2)65=5* 13,39=3* 13

(root number A) can be rounded up and down, or (root number 13) can be rounded up and down and then multiplied by (root number 3).

Get (root number 15)/3.

3.( 1) Merge the similar terms and get the original formula =4 (radical number 5)- 5 (radical number 2).

(2)75=25*3,27=9*3, 12=4*3

Original formula =2*5* (radical number 3)- 3*3* (radical number 3)+ 2* (radical number 3)

=3* (root number 3)

(3)72=36*2, 18=9*2

The original formula =6* (radical number 2)+3* (radical number 2)- 3* (radical number 2)/2.

= 15* (root number 2)/2