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Sagot :

Bonjour

B=(5-2y)-(-3y+7)

B = 5 - 2y + 3y - 7

B = y - 2

D= (2r-5)(3r+2)-(r^+6)

D = 6r² + 4r - 15r - 10 - r - 6

D = 6r² - 12r - 16.

Bonjour,

B=(5-2y)-(-3y+7)

= 5-2y +3y -7

= y -2

D= (2r-5)(3r+2)-(r²+6)

6r²  +4r - 15r -10 -r² -6

= 5r²  -11r  -16

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