Odpowiedzi

2010-03-07T13:44:01+01:00
A) 1/3x-2=x+2
1/3x-x=2+2
-1/3x=4 |*(-3)
x=-12
b)1-6/7x=4/7
-6/7x=-1+4/7
-6/7x=3/7 |*(-7/6)
x=-1/2
c)6(1/4x-2)=18
1,5x-12=18
1,5x=18+12
1,5x=30 |:1,5
x=20
2 3 2
2010-03-07T13:52:09+01:00
A)
x/3 + 1 = 5/6 + x/2
1/3x + 1 = 5/6 + 1/2x
1/3x - 1/2x = 5/6 - 1
2/6x - 3/6x = - 1/6
1/6x = - 1/6 |*6/1
x = 1

b)
2x - 3/4 = 1/2 + x |*4
1 5 1