Odpowiedzi

2010-03-17T12:21:19+01:00
A)
(2x-3)-(x+5)+(x+4)
2x - 3 - x - 5 + x + 4
2x - 4

b)
(3a-20) - (a+4) + (a-3)
3a - 20 - a - 4 + a - 3
3a - 27
2010-03-17T12:22:04+01:00
A)(2x-3)-(x+5)+(x+4) = 2x-3-x-5+x+4
4x = 12
x = 3

b)(3a-20)-(a+4)+(a-3) = 3a-20-a-4+a-3
3a = -27
a = -9

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