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Sagot :

Réponse:

a) 3x×5y=3×7×5×3

=21×15

= 315

b) 4xy+x+y= 4×7×3+7+3

=84+7+3

=94

c) (3x+1)(12-2y)=3x×12-3x×2y +1×12-1×2y

=3×7×12-3×7×2×3+12-2×3

=252-126+12-6

=126+6

=132

bonjour ,

3*7*5*3 = 21*15 = 315

4*7*3 + 7+3 = 84+10 = 94

(3*7+1)(12-2*3) = 22 * 6 = 132

bonne journée

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