1 a) 3x - 5 = 6+x 3x-x = 6+5 2x = 11 / :2 x = ¹¹/₂ x = 5 ½ b) 4x + 9 = 3x -7 4x-3x = -7-9 x = -16 c) 3-2x=4-2x -2x+2x = 4-3 0 = 1 d) 7(2-3x) = 4x +5 14-21x = 4x+5 -21x-4x = 5-14 -25x = -9 / : (-25) x = ⁹/₂₅ 2 a)(3-2x)-(x+4) - (2x+5)=(3x-4)-(5x+7) 3-2x-x-4 -2x-5 = 3x-4-5x-7 -2x-x-2x-3x+5x = -4-7-3+4+5 -3x = -5 / :(-3) x = ⁵/₃ x = 1 ⅔ b)(4-x)-(2x+3)+(x-4)=-(2x-3)-(x+7) 4-x-2x-3+x-4 = -2x+3-x-7 -x-2x+x+2x+x = 3-7-4+3+4 x = -1
1 a) 3x - x = 6+5 2x=11 / :2 x = 5,5 b) 4x - 3x = - 7 - 9 x = -16 c) -2x+2x = 4-3 0=1 sprzeczne d) 14 - 21 x = 4x +5 -21x-4x = 5-14 -25x = - 9 /: -25 x = 9/25 2.a)(3-2x)-(x+4) - (2x+5)=(3x-4)-(5x+7) 3-2x - x-4 -2x-5=3x - 4 -5x-7 -2x-x-2x-3x+5x = -4-7+5+4-3 -3x = -5/:-3 x = 5/3 = 1 2/3 b)(4-x)-(2x+3)+(x-4)=-(2x-3)-(x+7) 4-x -2x-3 +x -4 = -2x+3-x-7 -x-2x+x+2x+x=3-7-4+3+4 x= -1
Zad.1 a) 3x - 5 = 6+x 3x-x=6+5 2x=11 /:2 x=11/2 x=5 i 1/2 b) 4x + 9 = 3x -7 4x-3x=-7-9 x=-16 c) 3-2x=4-2x -2x+2x=4+3 0=7 równanie sprzeczne. d) 7(2-3x) = 4x +5 14-21x=4x+5 -21x-4x=5-14 -25x=-9 /:(-25) x=9/25 Zad.2 a)(3-2x)-(x+4) - (2x+5)=(3x-4)-(5x+7) 3-2x-x-4-2x-5=3x-4-5x-7 -2x-x-2x-3x+5x=-3+4+5-4-7 -3x=1 /:(-3) x=-1/3 b)(4-x)-(2x+3)+(x-4)=-(2x-3)-(x+7) 4-x-2x-3+x-4=-2x+3-x-7 -x-2x+x+2x+x=-4+3+4+3-7 x=-1 ;))
