Question

Ajutorrr!!! 80 pcte

1. Rezolvati in R ecuatia :
a) 3(2x-1)+7=5(x-1)+7
b) 3,1*(1-3x)+x=0,4*(x-14)
c) 0,8(0,5-2x) =2x+0,4

2.Rezolvati in R ecuatia.
a)2(1-2x)-3(1-3x)=4
b)2(x+3)=1+3(x-1)
c)2(x-9)=2x+1
d)3(2x+1)-2(x+1)=4x+1

Answer 1

1a 6x-3+7=5x-5+7
6x+4=5x+2
x=-2
b. 3,1-9,3+x=0,4-5,6
-8,3-0,4=-5,6-3,1
-8,7=8,7, x=-1
c. 4-1,6x=2x+0,4
-1,6x-2x=0,4-4
-3,6x=-3,6, x=1

2a  2-4x-3-9x=4
5x-1=4
5x=5, x=1
b. 2x+6+1=1+3x-3
2x-3x=-6-2
-x=-8, x=8
c. 2x-18=2x+1, x∈Ф
d. 6x+3-2x-2=4x+1
4x+1=4x+1, x∈R