b) B = 4,4x^2y – 40,6xy^2 + 3,6xy^2 – 1,4x^2y – 26.
b) B = 4,4x2y – 40,6xy2 + 3,6xy2 – 1,4x2y – 26.
b) B = 4,4x2y – 40,6xy2 + 3,6xy2 – 1,4x2y – 26
= (4,4x2y – 1,4x2y) – (40,6xy2 – 3,6xy2) – 26
= 3x2y – 37xy2 – 26.