Sagot :
A=5a-2a+7a
=10a
b=5x-7+8x+4
=13x-3
c= 3a+5b-7+a-b-3
=4a+4b-10
D=-1+(a+2b+4)+(-a-2b+2)
=-1+a+2b+4-a-2b+2
=5
E=-4ax5ax3a
=60a³
F=(x-3)-(x+5)-(x-7)
=x-3-x-5-x+7
=-x-1
g=3(2z-7)
=6z-21
=10a
b=5x-7+8x+4
=13x-3
c= 3a+5b-7+a-b-3
=4a+4b-10
D=-1+(a+2b+4)+(-a-2b+2)
=-1+a+2b+4-a-2b+2
=5
E=-4ax5ax3a
=60a³
F=(x-3)-(x+5)-(x-7)
=x-3-x-5-x+7
=-x-1
g=3(2z-7)
=6z-21
A=5a-2a+7a = 10 a
B=5x-7+8x+4 = 13x - 3
C= 3a+5b-7+a-b-3 = 4 a + 4 b -10 = 4 (a + b - 10/4 ) = 4 ( a + b - 5/2 )
D=-1+(a+2b+4)+(-a-2b+2) = 5
E=-4ax5ax3a = - 60 a^3
F=(x-3)-(x+5)-(x-7) = - x - 1 = - ( x + 1)
G=3(2z-7) = 6 z - 21 = 2 z - 7
B=5x-7+8x+4 = 13x - 3
C= 3a+5b-7+a-b-3 = 4 a + 4 b -10 = 4 (a + b - 10/4 ) = 4 ( a + b - 5/2 )
D=-1+(a+2b+4)+(-a-2b+2) = 5
E=-4ax5ax3a = - 60 a^3
F=(x-3)-(x+5)-(x-7) = - x - 1 = - ( x + 1)
G=3(2z-7) = 6 z - 21 = 2 z - 7