Rozwiąż równania: a) 3x = 2x +1/7 b) 3 - x = - 2x c) 5y = 13 d) 1/7x = -2 e) - 7b = 7/8 f) 7a+7=35 g) 2 - x = 5- 2x h) 69 - x = x + 96
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a) 3x-2x=1/7
1x=1/7
b) 3 - x = - 2x
-x+2x = -3
1x= -3
c) 5y = 13
5y=13 l : 5
y = 2 i 3/5
d) 1/7x = -2 < nie umiem ;c >
e) - 7b = 7/8
-7b =7/8 l : -7
-1b = -1/8 l : 1
b = 1/8
f) 7a+7=35
7a=35-7
7a=28 l :7
a= 4
g) 2 - x = 5- 2x
-x+2x = 5 - 2
x = 3
h) 69 - x = x + 96
-x + ( -x) = 96 - 69
-2x = 27 l : (-2)
x = 13,5