Question

1) (-3x²) · ( -5xy³),x,y ∈R
2) (√2+√3)² - (1+√6)²∈N, oricare ar fi x∈R
3) 3(x-y)-(2x+y)+(y-x)=
4)  (x-1)(x+3)=
5) Aratati ca suma patratelor  a trei nr. intregi consecutive da restul 2 la impartirea cu 3.
6) x² +1\x², stiind ca x+1\x=3
7) a) 16-8x+x²
b) x²-2xy+y²-z²
c) ax-ay-bx+by

Answer 1

1) 15x³y³
2)2+2√6+3-1-2√6+6=6
3)3x-3y-2x-y+y-x=-3y
4)x²+3x-x-3=x²+2x-3