zad 121
b) 6-x-x/2=4
6-1x-1/2x=4
6-3/2x=4 / ( to jest prosta kreska) -6
-3/2x=-2 / *2
-3x=-4 /:(-3)
X= 4/3
X= 1 1/3
c) 3/4x-x-1=0
-1/4x-1=0 / +1
-1/4x=1 / *(-4)
x=-4
d) 1/5x+3=5-1/2x /+1/2x
1/5x+1/2x+3=5 /-3
2/10x+5/10x=2
7/10x=2 /*10
7x=20 /:7
x=20/7
x=2 6/7
Odpowiedź:
a)
2x - 5 - x - 3=8
2x - x=8+5+3
x=16
b)
6 - x - x/2=4
- x - x/2=4 - 6
- 3/2x= - 2 /*( - 2/3)
x=4/3= 1 1/3
c)
3/4x - x - 1=0
3/4x - x=1
- 1/4x=1 /*( - 4)
x= - 4
d)
1/5x+3=5 - 1/2x
1/5x+1/2x=5 - 3
7/10x=2 /*10/7
x=20/7=2 6/7
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zad 121
b) 6-x-x/2=4
6-1x-1/2x=4
6-3/2x=4 / ( to jest prosta kreska) -6
-3/2x=-2 / *2
-3x=-4 /:(-3)
X= 4/3
X= 1 1/3
c) 3/4x-x-1=0
-1/4x-1=0 / +1
-1/4x=1 / *(-4)
x=-4
d) 1/5x+3=5-1/2x /+1/2x
1/5x+1/2x+3=5 /-3
2/10x+5/10x=2
7/10x=2 /*10
7x=20 /:7
x=20/7
x=2 6/7
Odpowiedź:
a)
2x - 5 - x - 3=8
2x - x=8+5+3
x=16
b)
6 - x - x/2=4
- x - x/2=4 - 6
- 3/2x= - 2 /*( - 2/3)
x=4/3= 1 1/3
c)
3/4x - x - 1=0
3/4x - x=1
- 1/4x=1 /*( - 4)
x= - 4
d)
1/5x+3=5 - 1/2x
1/5x+1/2x=5 - 3
2/10x+5/10x=2
7/10x=2 /*10/7
x=20/7=2 6/7