Sa se rezolve in Z barat (ecuatiile):
a) -3(x+1)=2(x+1)-75
b) 5(x-2)- 7(x+4)=0
c) 2(x-3) -5 ( 3x+4) = -8x + 4
Răspunsuri la întrebare
2016-04-13 13:01:38
a) -3x-3=2x+2-75 -3x-3=2x-73 -5x=-70 => 5x=70 => x=14 b) 5x-10-7x-28=0 2x=38 x=19 c)2x-6-15x-20=-8x+4 -13x-26=-8x+4 -5x=30
2016-04-13 13:02:53
a) - 3(x + 1) = 2(x + 1) - 75 - 3x - 3 = 2x + 2 - 75 - 3x - 2x = 3 - 73 - 5x = - 70 x = 70 : 5 x = 14 b) 5(x - 2) - 7(x + 4) = 0 5x - 10 - 7x - 28 = 0 - 2x = 38 x = - 38/2 x = -19 c) 2(x - 3) - 5(3x + 4) = - 8x + 4 2x - 6 - 15x - 20 = - 8x + 4 - 13x + 8x = 26 + 4 - 5x = 30 x = - 30/5 x = - 6
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