Identify the terms, their coefficients for each of the following expressions.
(i) 5xyz2−3zy
(ii) 1+x+x2
(iii) 4x2y2−4x2y2z2+z2
(iv) 3−pq+qr−rp
(v) x2+y2−xy
(vi) 0.3a−0.6ab+0.5b