Question

1)2(x+5)-4(x-3)=21-x
2)√3+modul 1-√3 inchidem modul + modul √2 -4 inchide modul=
3) paranteza patrata (2 la puterea 30)la puterea 0 -(2 la puterea 0)la puterea 30 inchide paranteza patrata : (15/4)la puterea 1994=
4)E(x)=1/x²-1 + (1 + x-1/2):(x+1/2 - 1) totul supra x²+2x+2
a)forma simpla.
b)pentru ce valori ale lui x E(x) nu are sens
5)a/8=b/1 at 4a+3b/b-a=?

Answer 1

1)2(x+5)-4(x-3)=21-x
2x+10-4x+12=21-x
+10+12-21=+x
x=1

2)√3+I1-√3I  + I√2 -4 I=
=√3-1+√3  -√2 +4 =
=2√3-√2+3

 3) [(2³⁰)⁰ -(2⁰)³⁰] : (15/4)¹⁹⁹⁴=(1-1):(15/4)¹⁹⁹⁴=0:(15/4)¹⁹⁹⁴=0

5 a/8=b/1 at 4a+3b/b-a=?
a=8b
(4a+3b)/(b-a)=
=(4*8b+3b)/(b-8b)=
=(32b+3b)(-7b)=
=35b/(-7b)=
=35/(-7)=-5