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x+10%
x-10%
b)x:5(jedna piąta x)
x+20%
x-20%
c)2:5*x (dwie piąte x)
x+40%
x-40%
x + 10%
x - 10%
b)20x
20 + x
20 - x
c) 40x
40+x
40-x
w tym pierwszym pisz bez znaków procentów
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