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.