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15.
a) 1/2y +3 = 7
1/2y = 4 /x2
y = 8
b)3/5y 2/5 = 4
3/5y = 20/5 - 2/5
3/5y = 18/5 /:3/5
y = 6
c)3(y+2)= 5
3y = -1 /:3
y = -1/3
d)7(y+3) = 5y +2 + 2y
7y + 21 = 7y +2
y=0
e)y/2 + 1/3 = 7/6
3y/6 + 2/6 = 7/6
3y+2/6 = 7/6 /x 6
3y +2 = 7
3y=5 /:3
y = 3/5
Zad. 16
a)0,2x + 0,3 = 1,3
0,2x = 1 /x5
x = 5
b)5x- 0,8 = 0,1 + 2x
3x = 0,9 /:3
x = 0,3
c)8x - 0,2 = 8x - 0,1
x = 0
d)0,01x + 17 = -0,16x
17 = -0,17x /:(-0,17)
-100 = x
e)-0,07(10x - 1) = 0,3x
-0,7x +0,07 = 0,3x
0,07 = x
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15.
a) 1/2y +3 = 7
1/2y = 4 /x2
y = 8
b)3/5y 2/5 = 4
3/5y = 20/5 - 2/5
3/5y = 18/5 /:3/5
y = 6
c)3(y+2)= 5
3y = -1 /:3
y = -1/3
d)7(y+3) = 5y +2 + 2y
7y + 21 = 7y +2
y=0
e)y/2 + 1/3 = 7/6
3y/6 + 2/6 = 7/6
3y+2/6 = 7/6 /x 6
3y +2 = 7
3y=5 /:3
y = 3/5
Zad. 16
a)0,2x + 0,3 = 1,3
0,2x = 1 /x5
x = 5
b)5x- 0,8 = 0,1 + 2x
3x = 0,9 /:3
x = 0,3
c)8x - 0,2 = 8x - 0,1
x = 0
d)0,01x + 17 = -0,16x
17 = -0,17x /:(-0,17)
-100 = x
e)-0,07(10x - 1) = 0,3x
-0,7x +0,07 = 0,3x
0,07 = x