Answered

a=4*(2+x)    b=3*(2y-5)   c=-3*(2x+6)   d=-3a(2a-4)  

a=6*b+6t     b=5x-5y      c=2a+2         d=9x²-6xy

a=3+(x+6)   b=x-(x-9)     c=z+(-3-z²)    d=6-(-a+8)

Sagot :

AFTERSHOCK
a = 4*(2+x)    
a = 4x+8

b = 3*(2y-5)
b = 6y-15
  
c = -3*(2x+6)  
c = -6x-18

d = -3a(2a-4)  
d = -6a²+12a

(J'imagine qu'ici il faut factoriser)

a = 6b+6t  
a = 6(b+t)

b = 5x-5y
b = 5(x-y)

c = 2a+2  
c = 2(a+1)

d = 9x²-6xy
d = 3x(3x-2y)

a = 3+(x+6)
a = x+9

b = x-(x-9)
b = 9

c = z+(-3-z²)
c = -z²+z-3

d = 6-(-a+8)
d = a-2