Rozwiąż i sprawdź:
a) 2x + 5 = 7 - x
b) 6x + 4 = x + 6
c) 5x - 7 = 8 - 2x
2x+x=7-5
3x=2 I:3
x=2/3
spr.
2*2/3+5=7-2/3
4/3+15/3=21/3-2/3
19/3=19/3
6i1/3=6i1/3
6x-x=6-4
5x=2 I:5
x=2/5
6*2/5+4=2/5+6
12/5+20/5=2/5+30/5
32/5=32/5
6i2/5=6i25
5x+2x=8+7
7x=15 I:7
x=15/7=2 1/7
spr
5*15/7-7=8-2*15/7
75/7-49/7=56/7-30/7
26/7=26/7
3i5/7=3i5/7
2x + x = 7 - 5
3x = 2
x = 2/3
sprawdzenie
2 * 2/3 + 5 = 7 - 2/3
4/3 + 5 = 6 1/3
1 1/3 + 5 = 6 1/3
6 1/3 = 6 1/3
L = Pb) 6x + 4 = x + 6
6x - x = 6 - 4
5x = 2
x = 2/5 = 2/5
6 * 2/5 + 4 = 2/5 + 6
12/5 + 4 = 6 2/5
2 2/5 + 4 = 6 2/5
6 2/5 = 6 2/5
L = P c) 5x - 7 = 8 - 2x
5x + 2x = 8 + 7
7x = 15
x = 15/7 = 2 1/7
5 * 15/7 - 7 = 8 - 2 * 15/7
75/7 - 7 = 8 - 30/7
10 2/7 - 7 = 8 - 4 2/7
3 5/7 = 3 5/7
L = P
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a) 2x + 5 = 7 - x
2x+x=7-5
3x=2 I:3
x=2/3
spr.
2*2/3+5=7-2/3
4/3+15/3=21/3-2/3
19/3=19/3
6i1/3=6i1/3
b) 6x + 4 = x + 6
6x-x=6-4
5x=2 I:5
x=2/5
spr.
6*2/5+4=2/5+6
12/5+20/5=2/5+30/5
32/5=32/5
6i2/5=6i25
c) 5x - 7 = 8 - 2x
5x+2x=8+7
7x=15 I:7
x=15/7=2 1/7
spr
5*15/7-7=8-2*15/7
75/7-49/7=56/7-30/7
26/7=26/7
3i5/7=3i5/7
a) 2x + 5 = 7 - x
2x + x = 7 - 5
3x = 2
x = 2/3
sprawdzenie
2 * 2/3 + 5 = 7 - 2/3
4/3 + 5 = 6 1/3
1 1/3 + 5 = 6 1/3
6 1/3 = 6 1/3
L = P
b) 6x + 4 = x + 6
6x - x = 6 - 4
5x = 2
x = 2/5 = 2/5
sprawdzenie
6 * 2/5 + 4 = 2/5 + 6
12/5 + 4 = 6 2/5
2 2/5 + 4 = 6 2/5
6 2/5 = 6 2/5
L = P
c) 5x - 7 = 8 - 2x
5x + 2x = 8 + 7
7x = 15
x = 15/7 = 2 1/7
sprawdzenie
5 * 15/7 - 7 = 8 - 2 * 15/7
75/7 - 7 = 8 - 30/7
10 2/7 - 7 = 8 - 4 2/7
3 5/7 = 3 5/7
L = P