Răspuns:
6. A) 2x-5y+3y-x
=X-2y
B) (7x-5y) - ( 3x-5y) +2x
=7x-5y-3x+5y+2x
= 6x
C) x²y+xy-xy²-(xy-xy²+x²)
= x²y+xy-xy²-xy+xy²-x²
= x²y - x²
D) 2(x+y-xy) - 3(xy-x-y)+(y-x-xy)
= 2x+2y - 2xy - 3xy+3x+3y+y-x-xy
= 4x +6y - 6xy
E) - 4(x+y-z) +3(x-y+z)-2(-x+y+z)
= - 4x-4y+4z+3x-3y+3z+2x-2y-2z
= x - 9y +5z
7. = A) t⁴+5t³-14t
B) (a²+1)-(a²-1)(a²+1)
(a²+1)-(a⁴-1)
a²+1-a⁴+1
-a²+2
C)=3(z³-z²+z+z²-z+1)-3(z³-z²-z+1)
= 3(z³+1)-3z³+3z²+3z-3
= 3z³+3-3z³+3z²+3z-3
=3z²+3z
D)= b^8+4b⁴+4-(b⁴-4)(b⁴+4)
=b^8+ 4b⁴+4-(b^8-16)
=b^8+4b⁴+4-b^8+16
=4b⁴+20
8.A)= x²-4x+4-(x²-x+3x-3)
=X²-4x+4-x²+x-3x+3
=-6x+7
B) = (x²-4)(x²+4)-(x⁴-2x²+1)
=x⁴-16-x⁴+2x²-1
=2x²-17
C)= (2x²-xy+4xy-2y²)-2(x²+2xy+y²)
=2x²+3xy-2y²-2x²-4xy-2y²
= - 4y²-xy
Explicație pas cu pas:
Sper ca te am ajutat!!
