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2009-11-01T20:06:46+01:00
1) 2x-√2=x√2+1

2) 1/2y-2y+1/5-y-1/3 (1-y)=8-3y/6


1)
2x −x√2 = 1+√2
x(2 −√2)=1 +√2
x = 1+√2 / 2−√2 = (1+√2)(2+√2) / (2−√2)(2+√2) = 4+3√2 / 4−2 = 2+ 3/2 √2
x = 2 + 3/2 √2

2)
-2,5y + 1/5 - 1/3 + 1/3y = 8 - 3y/6
-75/30y + 10/30y + 3/15 - 5/15 = 8 - 3y/6
-13/6y - 2/15 = 8 -3y/6 |*6
-13y - 12/15 = 48 -3y
-10y = 48 + 12/15
-10y = 48 + 4/5
-10y = 48 + 0.8
-10y = 48,8 |:(-10)
y = -4,88