Ejercicio 18

145. 1/2x2 +1/3xy, 1/2xy +1/4y2

1/2x2   +1/3xy

            1/2xy +1/4y2

1/2x2  1/6xy +1/4y2

146. a2 +1/2ab, -1/4ab +1/2b2, -1/4ab -1/5b2

a2 +1/2ab

     -1/4ab +1/2b2

    -1/4ab -1/5b2

a2 -0/32ab -3/10b2

147. x2 +2/3xy, -1/6xy +y2, -5/6xy +2/3y3

X2 +2/3xy

     -1/6xy +y2

    -5/6xy +2/3y2

X2 -5/15xy +1/3y2

148. 2/3a2 +1/5ab -1/2b2, 5/6a2 -1/10ab +1/6b2, -1/12a2 +1/20ab -1/8b2

2/3a2 +1/5ab -1/2b2

5/6a2 -1/10ab +1/6b2

-1/12a2 +1/20ab -1/3b2

243/21a2 +150/100ab -24/36b2

149. 3/4x2 -1/2y2, -2/5xy +1/6y2, 1/10xy +1/3y2

3/4x2 -1/2y2

          +1/6y2 -2/5xy

         +1/3y2 1/10xy

3/4x2 +24/36y2 +15/50xy

150. 5/6x2 -2/3y2 +3/4xy, -1/2xy -1/6x2 +1/8y2, 5/6xy -1/3x2 +1/4y2

5/6x2 -2/3y2 +3/4xy

        -1/6y2 -1/2xy

        +1/8y2

-1/3x2 +1/4y2 5/6xy

+9/8x2 +264/576y2 52/48xy

151. a3 -1/2ab2 +b3, 5/6ª2b -3/8ab2 -2b3, 1/4ª3 -1/2ª2b -3/5b3

a3 -1/2ab2 +b3

    -3/8ab2 -2b3 5/6a2b

1/4a3        -3/5b3 -1/2a2b

3/4a3 -2/16ab2 -1/10b3 +4/12a2b

152. x4 –x2 +5, 2/3x3 -3/8x -3, -3/5x4 +5/6x3 -3/4x

X4          –x2 +5

                      -3 2/3x3   -3/8x

-3/5x4               +5/6x3 -3/4x

-2/5x4 –x2 +2 +3/8x3 -12/32x

153. 2/3m3 -1/4mn2 +2/5n3, 1/6m2n +1/8mn2 -3/5n3, m3 -1/2, n –n3

2/3m3 -1/4mn2 +2/5n3

           +1/8mn2 -3/5n3 1/6m2n

m3                                              -1/2

                             n3                           n

1/3m3 +4/32mn2 -30n3 1/6m2n - 1/2  n

154. x4 +2x2y2 +2/7y4, -5/6x4 +3/8x2y2 -1/6xy3 -1/14y4, 5/6x3y -1/4x2y2 +1/7y4

X4 +2x2y2 +2/7y4

-5/6x4 +3/8x2y2 -1/4y4 -1/6xy3

       -1/4x2y2 +1/7y4                    5/6x3y

+1/6x4 +72/64x2y2 +35/196y4 -1/6xy2 5/6x3