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A= -18r +13 - 2x -14 B= y +25 - 12y2 +7y - 15 + 20y2 D=(5x - 12) + (8x + 15) E= 8x x 2x + 5x F=7x x x - 2x C= 5x +7+ (-12x-8) Vous pouvez m'aider svp ? ​

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YAYAS7964

A = -18r +13 - 2x -14

= -18r +13 -14 - 2x

= -18r -1 -2x

B= y +25 - 12y2 +7y - 15 + 20y2

= y +25 - 24y + 7y -15+ 40y

= y-24y+7y+40y +25 -15

= 24y +25 -15

= 24y + 10

C= 5x+7+(-12x-8)

= 5x+7-12x-8

= 5x -12x +7-8

= -7x -1

D= (5x - 12) + (8x + 15)

= 5x-13+8x+15

= 5x+8x-13+15

= 1

E= 8x × 2x + 5x

= 16x² +5x

F=7x × x - 2x

= 7x² - 2x