Question

4,5,6 si 7 sau daca puteti macar 4 si 5 va rog multtt
Este urgent

Answer 1

4.
15%___________30 lei
100%__________x
x=3000:15=200 lei pretul initial

5.
a)2√2·9√2 + 10√6/2√6 - 6√6/3√6=
36+5-2=
39
b)3+4√3+4+20-4√3-28+9=
8

6.
a)3x(x²+2x+1)=3x(x+1)²
b)(x+1)(4x-3)
c)(x+1+3)(x+1-3)=(x+4)(x-2)
d)(x+4)(x+2)
e)(x-6)(x-2)
f)x²(x+3)-4(x+3)=(x+3)(x²-4)=(x+3)(x-2)(x+2)