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a. 10a-0,6=3(2a+3)
b. 4x-3(3x-5)=2x
c. 2z/3-3z/4-1/6=1
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a.
10a-0,6 = 3(2a+3)
10a-0,6 = 6a+9
10a-6a = 9+0,6
4a = 9,6 /:4
a = 2,4
spr.
10·2,4-0,6 = 3(2·2,4+3)
24-0,6 = 3(4,8+3)
23,4 = 3·7,8
23,4 = 23,4
b.
4x-3(3x-5) = 2x
4x-9x+15 = 2x
4x-9x-2x = -15
-7x = -15 /: (-7)
x = -15/7
spr.
4·15/7-3(3·15/7-5) = 2·15/7
60/7-3(45/7-5) = 30/7
60/7-3·10/7 = 30/7
60/7-30/7 = 30/7
30/7 = 30/7
c.
2z/3-3z/4-1/6 = 1
8z/12-9z/12-2/12 = 1 /·12
8z-9z-2 = 12
8z-9z = 12+2
-z = 14 /:(-1)
z = -14
spr.
2·(-14)/3-3·(-14)/4-1/6 = 1
-28/3+42/4-1/6 = 1
-112/12+126/12-2/12 = 1
14/12-2/12 = 1
12/12 = 1
1 = 1