1.=(x+2y)？ +2xz+4yz+z？

=x？ +4xy+4y？ +2xz+4yz+z？

2.=(2x-3y)？ + 16z？ -2(2x-3y)*4z

=4x？ +9y？ - 12xy- 16xz+24yz

3. the same reason =y? +4x？ + 12x-4xy-6y+9

4. The things in the brackets on the left are understood as 3x+(-4y), which are multiplied by the three items on the right respectively, and then the sum is added. Don't forget the minus sign.

. =27x^3-64y^3

Five plus four? Do the same thing. You are very clever. . .

6。 Multiply by 4 to get: x 3+3x 2+9x-3x 2-9x-27, simplify, x 3 = 2, and get -25.

7。 Write first) (2x+2x1y) * (3x+2x1y) squared.

Then use the method of 4, take the bungalow and then use the method of 4.

8 is the same as 7.

9 10? Talk together

I don't know. I have to draw.

unwillingly

Give a simple example: (x 2+2xy+y 2) divided by (x+y)