Rozwiąż równania . DAM NAJ .
1. 6 4/5 = 1/7b - 1/5
2. -5y = 2,6-4y
3. 1(5+2x) = 6(2x-4)
4. 5(-2x- 2/5) + 7 = 25-6x
34/5 = 1/7b - 1/5 /*35
238 = 5b - 7
-5b = -245 /:(-5)
b = 49
-5y + 4y = 2,6
-y = 2,6 /:(-1)
y = -2,6
5 + 2x = 12x - 24
-10x = -29 /:(-10)
x = 2,9
-10x - 10/5 + 7 = 25 - 6x
-10x + 6x = 25 - 7 + 2
-4x = 20 /:(-4)
x = - 5
1) 6 4/5 + 1/5 = 1/7b
7 = 1/7b / *7
2) -5y +4y = 2,6
-y = 2,6 / * -1
3) 5 +2x = 12x - 24
5 + 24 = -2x + 12x
29 = 10x / : 10
4) -10x - 2 + 7 = 25 - 6x
-10x + 6x = 2 - 7 + 25
-4x = 20 ? / : (-4)
x = -5
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1. 6 4/5 = 1/7b - 1/5
34/5 = 1/7b - 1/5 /*35
238 = 5b - 7
-5b = -245 /:(-5)
b = 49
2. -5y = 2,6-4y
-5y + 4y = 2,6
-y = 2,6 /:(-1)
y = -2,6
3. 1(5+2x) = 6(2x-4)
5 + 2x = 12x - 24
-10x = -29 /:(-10)
x = 2,9
4. 5(-2x- 2/5) + 7 = 25-6x
-10x - 10/5 + 7 = 25 - 6x
-10x + 6x = 25 - 7 + 2
-4x = 20 /:(-4)
x = - 5
1) 6 4/5 + 1/5 = 1/7b
7 = 1/7b / *7
b = 49
2) -5y +4y = 2,6
-y = 2,6 / * -1
y = -2,6
3) 5 +2x = 12x - 24
5 + 24 = -2x + 12x
29 = 10x / : 10
x = 2,9
4) -10x - 2 + 7 = 25 - 6x
-10x + 6x = 2 - 7 + 25
-4x = 20 ? / : (-4)
x = -5