Odpowiedzi

2010-03-08T19:24:05+01:00
A)2x(x-5)-3(x²-2x)+(x-2)x=2x²-10x-3x²+6x+x²-2x=-10x+6x-2x=-4x-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= x³+2x²+x+4x³-4x²+6=5x³-2x²+x+6
d)12b*b-1√4+14*b²-2b√21-b-b²√3=12b²-12b√4+168*b²-2b√21-b-b²√3=12b²-24b+168*b²-2b√21-b-b²√3=12b⁴-24b³√21-12b³-12b⁴√3-24b³+48b²√21+24b²+24b³√3+168b²-336b√21-168b-168b²=12b(b³-2b²√21-b²-b³√3-2b²+4b√21+2b+2b²√3+14b-24√21-14-14b)