A 2 2 b 7 3 c 1 1 d 6 6 July 8, 2019 16 32 64 128 2 1a ^ 2 * b ^ 2 * c ^ 4 * (- 1 3/7) * b * c ^ 3 * d A(2 -3 2) c(0 7 6) d(2 4 2) 5) (2/3 * a - 3/7 * b) ^ 2 6) (7/8 * c - 4/7 * d) ^ 2
