Równania prosiłbym o szybkie wykonanie.
zad13
A)3+8+x/2=2x+13 B)2x-3x-7/4=x+1
C)5-x+5/3=2-x D)3x+4-x/5=x-1
zad 14
A) 5(3-x)+x-3/2=4x+5 b) 4(x-1)+2x-1/3=3x-1
c)2(5-x)-7-x/2=x-1 d) 3(2x-7)-3x-4/4=5-x
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Cupris
A) 3+8+x/2=2x+13 /*2
6+16+x = 4x + 26
-3x = 4 /: (-3)
x = - 4/3
B) 2x-3x-7/4=x+1
2x - 3x - 1,75 = x +1
-2x = 2,75 /:(-2)
x = - 1,375
C) 5-x+5/3=2-x / *3
15-3x+5 = 6-3x
-3x + 3x = 6-5-15
0 = -14 równanie sprzeczne.
d) 3x+4-x/5=x-1 /*5
15x + 20 - x = 5x - 5
9x = -25 /:9
x = -25/9
Zad.14
A) 5(3-x)+x-3/2=4x+5
15-5x + x -1,5 = 4x +5
-8x = -8,5 /: (-8)
x = 1,0625
b) 4(x-1)+2x-1/3=3x-1
4x - 4 +2x- 1/3 = 3x - 1 /*3
12x - 12 + 6x - 1 = 9x - 3
9x = 10 /:9
x = 10/9
c) 2(5-x)-7-x/2=x-1
10-2x-7-x/2=x-1 /*2
20-4x-14-x=2x-2
-7x = -8 /: (-7)
x = 8/7
d) 3(2x-7)-3x-4/4=5-x
6x-21-3x-1=5-x
4x = 27 / :4
x = 6,75