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Meilleure réponse !
2014-04-11T08:26:08+02:00
B. 24c + 12 = ( 24 + 12 ) * c = 36 * c = 36c
c. 3x - 15 = ( 3 - 15 ) * x = -12 * x = -12x
d. 21 - 7g = (21 - 7 ) * g = 14 * g = 14g
e. 18b + 9b = 27b
f. 10,3m - 5,1m = 5,2m

a. 15ac + 14 ac = 29ac
b. 23xy - 35xy = -12xy
c. 2a^2 + 8a^2 = 10a^2
d. 7x^2 - 12x^2 = -5x^2
e. 7ab + 5ba = 7ab + 5ab = 12ab
f. 9,8yz - 15yz = 5,2yz
g. 11y^2 - 5 - 3y^2 + 13 = 8y^2 + 8
h. 2b^2 - 8b - 9b^2 + 6b = -7b^2 - 2b