Te pojedyncze " - " w 2 pierwszych wersach to liczenie proporcjami to nie minusy.
a) 2 : x = 3 : (x-1) 2 - 3 x - x-1 2* (x-1) = 3x 3x = 2x - 2 3x - 2x = -2 x = -2 b) 4:(x+1) = 5 : x 4 - 5 x+1 - x 4x = 5(x+1) 4x = 5x + 5 4x - 5x = 5 -x = 5 x = -5 c) 3/5 = 2x-1: (2-5x) 3 - 2x-1 5 - 2-5x 2*(2-5x) = 5*(2x-1) 4 - 10x = 10x - 5 -10x -10 x = -5 -4 -20 x = -9 x = 0,45 d) (2x+1):(1-2x) = 2/3 2x+1 - 2 1-2x - 3 3*(2x+1) = 2*(1-2x) 6x +3 = 2 - 4x 6x + 4x = 2 - 3 10x = -1 x = -0,1 e) (0,4x-1):3 = (2x-5):2 0,4x-1 - 2x-5 3 - 2 2*(0,4x-1) = 3*(2x-5) 0,8x - 2 = 6x - 15 0,8x - 6x = -15 + 2 -5,2x = -13 x = 2,5 f) 4+x²:x = (2x-1):2 4+x² - 2x-1 x - 2 2*(4+x²) = x*(2x-1) 8 + 2x² = 2x² - x /-2x² 8 = -x x = -8
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Te pojedyncze " - " w 2 pierwszych wersach to liczenie proporcjami to nie minusy.
a) 2 : x = 3 : (x-1)
2 - 3
x - x-1
2* (x-1) = 3x
3x = 2x - 2
3x - 2x = -2
x = -2
b) 4:(x+1) = 5 : x
4 - 5
x+1 - x
4x = 5(x+1)
4x = 5x + 5
4x - 5x = 5
-x = 5
x = -5
c) 3/5 = 2x-1: (2-5x)
3 - 2x-1
5 - 2-5x
2*(2-5x) = 5*(2x-1)
4 - 10x = 10x - 5
-10x -10 x = -5 -4
-20 x = -9
x = 0,45
d) (2x+1):(1-2x) = 2/3
2x+1 - 2
1-2x - 3
3*(2x+1) = 2*(1-2x)
6x +3 = 2 - 4x
6x + 4x = 2 - 3
10x = -1
x = -0,1
e) (0,4x-1):3 = (2x-5):2
0,4x-1 - 2x-5
3 - 2
2*(0,4x-1) = 3*(2x-5)
0,8x - 2 = 6x - 15
0,8x - 6x = -15 + 2
-5,2x = -13
x = 2,5
f) 4+x²:x = (2x-1):2
4+x² - 2x-1
x - 2
2*(4+x²) = x*(2x-1)
8 + 2x² = 2x² - x /-2x²
8 = -x
x = -8
Naj ?. ; >