Question

Zapisz w jak najprostszej postaci
a) 2x(x-5)-3(x²-2x)+(x-2)x
b) a(a+b+c)-b(a-b+c)-c(a-b-c)
c) x(x²+2x+1)-(-4x³+8x²-6)/2
d) 12b•(b-1)/4+14•(b²-2b)/21-(b-b²)/3

Dam naj ;D

Answer 1

A)-6x
b)a²+b²+c²
c)3x³+2x²+x+3
d)?

Answer 2

A) 2x(x-5)-3(x²-2x)+(x-2)x=
=2x²-10x-3x²+6x+x²-2x=-6x
b) a(a+b+c)-b(a-b+c)-c(a-b-c)=
=a²+ab+ac-ab+b²-bc-ac+bc+c²=a²+b²+c²
c) x(x²+2x+1)-(-4x³+8x²-6)/2=
=2x²+2x²+x+4x²-8x²+6:2=
=2x²+2x²+x+4x²-8x²+3= x+3