Rozwiąż każde równanie, a następnie wstaw w lukę jego rozwiązanie wybrane spośród podanych.
I. 7x – 5 = 3x – 1 x =
II. 3 – (5x + 4) = –2 x =
III. 5(2x + 1) – 3 = 7x x =
IV. + 1 = x x =
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I.
7x-5= 3x -1
7x - 3x = -1 +5
4x = 4
x = 1
II.
3 - (5x+4) = -2
3 - 5x - 4 = -2
-5x = -2 +4 -3
-5x = -1
x = 1/5
III.
5(2x+1) -3 = 7x
10x +5 -3 = 7x
10x - 7x = 3 - 5
3x = -2
x = - 2/3
IV.
1 = x
x = 1