Odpowiedzi

2010-03-29T20:36:58+02:00
A) x+2x+x+9 = 4x +9
b)y+2y-5+11-y = 2y - 5 +11 = 2y +6
c) 3a + 4+ a-1+a+7 = 5a +4 -1+7 = 5a + 10
d) 10-2b + 6-b+10-b+4-b= 24-4b

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