EJERCICIO 21

154. A +b restar a –b

A +b

-a +b

0 +2b

155. 2x -3y restar –x +2y

2x -3y

+x -2y

+3x -5y

156. 8ª +b restar -3ª +4

8ª +b

+3ª    +4

11ª +b +4

157. x2 -3x restar -5x +6

X2 -3x

      +5x +6

X2x2_____________________________________

 +2x +6

158. x –y +z restar x –y +z

X –y +z

-x +y –z

0   0    0

159. x +y –z restar –x –y +z

X +y –z

+x +y –z

+2x +2y -2z

160. x2 +y2 -3xy restar –y2 +3x2 -4xy

X2 +y2 -3xy

-3x2 +y2 +4xy

-2x2 +2y2 +1xy

161. x3 –x2 +6 restar 5x2 -4x +6

X3 –x2 +6

     -5x2 +6 -4x

X3 -6x2 +12 -4x

162. y2 +6y3 -8 restar 2y4 -3y2 +6y

Y2 +6y3 -8

+3y2            2y4 +6y

+4y2 +6y3 -8 2y4 +6y

163. a3 -6ab2 +9ª restar 15ª2b -8ª +5

A3 -6ab2 +9ª

               +8ª 15ª2b +5

A3 -6ab2 +17ª 15ª2b +5

164. x4 +9xy3 -11y4 restar -8x3y -6x2y2 +20y4

X4 +9xy3 -11y4

               -20y4 +8x3y -6x2y2

X4 +9xy3 -31y4 +8x3y -6x2y2

165. a +b +c –d restar –a –b +c –d

A +b +c –d

+a +b –c +d

+2ª +2b 0 0

166. ab +2ac -3cd -5de restar -4ac +8ab -5cd +5de

Ab +2ac -3cd -5de

-8ab +4ac +5cd -5de

-7ab +6ac +2cd -10de

167. X3 -9x +6x2 -19 restar -11x2 +21x -43 +6x3

X3 -9x +6x2 -19

-6x3 -21x +11x2 +43

5x3 -30x +17x2 +24

168. y5 -9y3 +6y2 -31 restar -11y4 +31y3 -8y2 -19y

Y5 -9y3 +6y2 -31

     -31y3 +8y2       +11y4 -19y

Y5 -40y3 +14y2 -31 +11y4 -19y

169. 15m3 -9n3 +6m2n -8mn2 restar 14mn2 -21m2n +5m3 -18

15m3 -9n3 +6m2n -8mn2

-5m3        +21m2n -14mn2 -18

+10m3 -9n3 +27m2n -22mn2 -18

170. 4x3y -19xy3 +y4 -6x2y2 restar –x4 -51xy3 +32x2y2 -25x3y

4x3y -19xy3 +y4 -6x2y2

+25x3y +32xy3    -32x2y2 +x4

+29x3y +32xy3 +y4 -38x2y2 +x4

171. m6 +m4n2 -9m2n4 +19 restar -13m3n3 +16mn5 -30m2n4 -61

M6 +m4n2 -9m2n4 +19

                +30m2n4 +61 +13m3n3 -16mn5

M6 +m4n2 +21m2n4 +80 +13m3n3 -16mn5

172. –a5b +6ª3b3 -18ab5 +42 restar -8ª6 +9b6 -11ª4b2 -11ª2b4

-a5b +6ª3b3 -18ab5 +42

                                      +8a6 -9b6 +11a4b2 +11a2b4

-a5b +6a3b3 -18ab5 +42 +8a6 -9b6 +11a4b2 +11a2b4

173. 1 –x2 +x4 –x3 +3x -6x5 restar –x6 +8x4 -30x2 +15x -24

1 –x2 +x4 –x3 +3x -6x5

+24 +30x2 -8x4     -15x       +x6

+25 +29x2 -7x4 –x3 -12x -6x5 +x6

174. ax +ax+1 –ax+2 restar 5ax -6ax+1 –ax+2

Ax +ax+1 –ax+2

-5ax +6ax+1 +ax+2

-4ax +7ax+1 0

175. ma –ma-1 +3ma—2 restar 3ma+1 -4ma +5ma-2 +8ma-3

Ma –ma-1 +3ma-2

+4ma -3ma+1 -2ma-2 -8ma-3

+5ma -4ma+1 -2ma-2 -8ma-3