Question

rezolvarile complete va rog,dau coroana

Answer 1

2(2x+3)+1=3(x+4)
4x+6+1=3x+12
4x+7=3x+12
4x-3x=12-7
x=5

3) 3(x+2)+2(x+4)=4x+29
3x+6+2x+8=4x+29
5x+14=4x+29
5x-4x=29-14
x=15

4) 4(2x+3)-8=7(x+1)
8x+12-8=7x+7
8x+4=7x+7
8x-7x=7-4
x=3

5) 56/(49-3x)=2
49-3x=56/2
49-3x=28
3x=49-28
3x=21
x=21/3
x=7

6) 6(4x-2)+5(4x-2)=18+2(4x-2)
24x-12+20x-10=18+8x-4
44x-22=8x+14
44x-8x=22+14
36x=36
x=36/36
x=1

7) 25x+4=79
25x=79-4
25x=75
x=75/25
x=3

8) 3^x*3^x=27^3
3^x+x+1=3^9
x+x+1=9
2x+1=9
2x=9-1
2x=8
x=8/2
x=4

9)2^x*4^x*8^x=64
2^x*2^2x*2^3x=64
2^x+2x+3x=2^6
x+2x+3x=6
6x=6
x=6/6
x=1

10) (2^5)^x=1
Orice numar la puterea zero da rezultatul unu
x=0

11) [(x-416/4+2)*5+3]*2+14=2000
[(x-104+2)*5+3]*2+14=2000
[(x-106)*5+3]*2+14=2000
(5x-530+3)*2+14=2000
(5x-527)*2+14=2000
10x-1054+14=2000
10x-1040=2000
10x=2000+1040
10x=3040
x=3040/10
x=304

12) (2+3^2*5)/47=3^2-2^x
(2+9*5)/47=9-2^x
(2+45)/47=9-2^x
47/47=9-2^x
1=9-2^x
2^x=8
2^x=2^3
x=3

13) 2^3-7*{6-5*[2^2-3(2-x)]}=1
8-7*{6-5*[4-3(2-x)]}=1
8-7*[6-5*(4-6+3x)]=1
8-7*[6-5*(3x-2)]=1
8-7*(6-15x+10)=1
8-42+105x-70=1
105x-104=1
105x=104+1
105x=105
x=105/105
x=1