1. It's very simple, for example, I have A yuan, I bought two notebooks with B yuan, and so on.

2. the square y of-x; The square of x of y

3. exclude the cubic square of x, that is, the coefficient is 0.

So a- 1=0 a= 1 b-3=0 b=3.

4.2x squared +3x-5

5. All five times are monomials.

6.x and 2y are reciprocal, so x+2y=0 x=-2y is substituted into -2y/y+2=-2+2=0.

7.2x -3x- 1 4 square

8, -3 Because the quadratic power of (x-a) is non-negative, the minimum value is 0.

9、2a-(2a-b+3)

10, (a-2) (a+2) = square of a-4.