2. Calcula la suma de cada grupo de monomios M_1+M_2 a 3m2;-4m2;-7m2;2m2 4. Suma a frac 21square 2 b 20z3;-80z3;18z3;12z3 b c 1,widehat 7ab2; 4/3 ab2;ab2; 14/9 ab2 c d 3/4 x3y+0,75x3y- 3/8 x3y-x3y ei -14,6m4n;-2,4m4n;7m4n; 21/10 m4n f 3 square root of 2r3;-2r3;-7 square root of 2r3;-4r3