Răspuns :
1.
a)5/√2=5√2/2
b)4/√3=4√3/3
c)4/5√3=4√3/15
d)4/√2=4√2/2=2√2
e)14/2√7=14√7/14=√7
2.
a)9a
b)12x²
c)20x¹⁰
d)3x⁴
e)(-5)a⁴
f)x²+4x+4
g)x²-9
h)2+2√6+3=5+2√6
i)2-2√10+5=7-2√10
j)2x²-9
k)9x²+12x+4
3.
a)10(x+y-z)
b)(x-2)(x+2)
c)(3x-8)(3x+8)
d)(x-3)²
e)(x+2)²
f)(x-6)(x+6)
g)(3x-1)²
h)(x-4)(x+4)
4.
f(0)=2
f(2)=4
a)f(0)+f(2)=6
c)f(1)=?3
f(1)=1+2=>f(1)=3(Adevarat)=>A(1;3) apartine graficului functie
f(-3)=?1
f(-3)=-3+2=>f(-3)=-1=>B(-3;1) NU apartine graficului functiei
a)5/√2=5√2/2
b)4/√3=4√3/3
c)4/5√3=4√3/15
d)4/√2=4√2/2=2√2
e)14/2√7=14√7/14=√7
2.
a)9a
b)12x²
c)20x¹⁰
d)3x⁴
e)(-5)a⁴
f)x²+4x+4
g)x²-9
h)2+2√6+3=5+2√6
i)2-2√10+5=7-2√10
j)2x²-9
k)9x²+12x+4
3.
a)10(x+y-z)
b)(x-2)(x+2)
c)(3x-8)(3x+8)
d)(x-3)²
e)(x+2)²
f)(x-6)(x+6)
g)(3x-1)²
h)(x-4)(x+4)
4.
f(0)=2
f(2)=4
a)f(0)+f(2)=6
c)f(1)=?3
f(1)=1+2=>f(1)=3(Adevarat)=>A(1;3) apartine graficului functie
f(-3)=?1
f(-3)=-3+2=>f(-3)=-1=>B(-3;1) NU apartine graficului functiei
1.a)5/√2=(rationalizezi cu √2)=5√2/2<br />b)4/√3=(rationalizezi cu √3)=4√3/3<br />c)4/5√3=[rationalizezi cu √3]=4√3/15<br />d)4/√2=[rationalizezi cu √2]=4√2/2(simplici pe 4cu 2)=2√2<br />e)14/2√7=[rationalizezi cu √7]=14√7/14=(simplifici 14cu 14)=√7<br />/ inseamna supra<br />2.a)5a-3a+7a=9a<br />b)3x•4x=12x²<br />d)3x⁴