Explicație pas cu pas:
a)
[tex] \frac{10x}{20y} simplifici \: primn10 = \frac{x}{2y} [/tex]
b)
[tex] \frac{(x + 1) {}^{2} }{(x + 1)}simplifici \: prim \: x + 1 = \frac{ x+ 1}{1} = x + 1[/tex]
c)2x³-50=factor comun 2x(x²-25)=x²-5²=FORMULA a²-b²= (a+b)x(a-b)=(x+5)x(x-5)
x²-19x+25= FORMULA a²-2ab+b² =(a+b)²=
=(x+5)²
[tex] \frac{( x+ 5) \times ( x- 5)}{(x + 5) {}^{2} } = simplificam \: prim \: x + 5 = \frac{ x- 5}{ x+ 5} [/tex]
