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2010-03-01T17:27:38+01:00
A)-5x-3=17
-5x = 17+3
-5x=20 / : (-5)
x= -4

b)6x-(8+x)=6x
6x-8-x=6x
6x-x-6x = 8
-x = 8 / :(-1)
x = -8

c)10(2x-3)=10
20x-30 = 10
20x = 10+30
20x = 40 / : 20
x = 2

d)3(-2+4x)=6(5x-2)
-6+12x = 30x-12
12x-30x = -12 +6
-18x = -6 / : (-18)
x = ⁶/₁₈
x=⅓
2010-03-01T17:32:09+01:00
A) -5x=17+3
-5x=20
x=4
b)6x-8-x=6x (6x sie skróci)
-x=8
x=-8
c)20x-30=10
20x=10+30
20x=40
x=2
d)-6+12x=30x-12
12x-30x=-12+6
-18x=-6
x=3