7a+7 równa się 35
2-xrówna się 5-2x
69-xrówna się x+96
jedna druga c+5 r5ówna się c+8
1.
7a + 7 = 35 |- 7
7a = 35 - 7
7a = 28 |: 7
a = 4
2.
2 - x = 5 - 2x |+ x
2 = 5 - x |- 5
-3 = -x | * -1
3 = x
3.
69 - x = x + 96 |+ x
69 = 2x + 96 |- 96
-27 = 2x |: 2
-13,5 = x
4.
1/2c + 5 = c + 8 |- 1/2c
5 = 1/2c + 8 |- 8
-3 = 1/2c |* 2
-6 = c
Pozdro.
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1.
7a + 7 = 35 |- 7
7a = 35 - 7
7a = 28 |: 7
a = 4
2.
2 - x = 5 - 2x |+ x
2 = 5 - x |- 5
-3 = -x | * -1
3 = x
3.
69 - x = x + 96 |+ x
69 = 2x + 96 |- 96
-27 = 2x |: 2
-13,5 = x
4.
1/2c + 5 = c + 8 |- 1/2c
5 = 1/2c + 8 |- 8
-3 = 1/2c |* 2
-6 = c
Pozdro.