Question

ma puteti ajuta
e exercitiul 9
acela incercuit

Answer 1

a) 3 3/5 x +1 = 2x +9/4
18/5 x +1 = 2x +9/4
72x+20=40x+45
32x=25
x=25/32

b)4x/3+1=x+5,3
4x+3=3x+15,9
x=12,9
x=129/10

c)1 1/9 x +0,5=x+6,7
10x/9=x+6,2
10x=9x+55,8
x=55,8
x=558/10=279/5

d)2x+8=x+15
x=7

e) 0,(8)+3x=2x+6
8/9+x=6
x=6-8/9
x=46/9

f)3x+6,(2)=x+11,(4)
3x+(62-6)/9=x+(114-11)/9
3x+56/9=x+103/9
27x+56=9x+103
18x=47
x=47/18

Answer 2

a   18x/5+1=2x+9/4  numitorul 20
   72x+20=40x+36
72x-40x=36-20
32x=16
x=16/32=1/2=0,5

b 4x/3+1=x+35/10
4x/3+1=x+7/2  numitorul 6
8x+6=6x+21
8x-6x=21-6
2x=15
x=15/2=7,5
c 10x/9+1/2=x+67/10  numitorul 90
100x+45=90x+603
100x-90x=603-45
10x=558
x=558/10=279/5=55,8

d 2x+8=x+15
2x-x=15-8
x=7

e  8/9+3x=2x+6  
8+27x=18x+54
27x-18x=54-8
9x=46
x=46/9=5.(1)

f   3x+62-6/9=x+114-11/9
 27x+56=9x+103
27x-9x=103-56
18x=47
x=47/18=2,6(1)