Réponses

2013-01-20T14:57:24+01:00

A= 3(2y-6)6(3-5y)

A= 6y-18+18-30y

A= - 24y

 

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

B=  5-2y+3y-7

B= y-2

 

C=4(6+z)+(z-3)(2-z)

C=24+4z+2z-z(aucarré)-6+3z

C=-z(aucarré)+9z+18

2013-01-20T15:06:05+01:00

A = 6y-18 +3+5y = 11y -15

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

C = 24+4z +( 2z-z²-6+3z) = 24+4z+2z-z²-6+3z

= -z²+9z+18

D = 6t²+4t-15t-10-t²+6

= 5t²-11t-4