Question

ajutatima va rog la ex 11pana la ora 12

Answer 1

a) 2•[1+2•(1+2x)]=78
[1+2•(1+2x)]=39
2•(1+2x)=38
1+2x=19
2x=18
x=9

b) x^2+3x+2-56=0
x^2+3x-54=0
▲=9+4•54
▲=9+216
▲=225 => rad▲=15
x1=(-3-15)/2=(-9)
x2=(-3+15)^2=6€N

sau

x+1=7 => x=6
și x+2=8 => x=6

c)(x:50+30):6=6
x:50+30=36
x:50=6
x=300

d) 10•(x+2)+3•(x+2)=39
(x+2)•(10+3)=39
13•(x+2)=39
x+2=3
x=1