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Zamien ulamek na zwykły
4,67(21) = 4,672121212121...
467,21212121 ... = 100x
4,6721212121... = x (odejmuję stronami)
462,54 = 99x / :99
x = 46254/9900 = 15418/3300
2.
opusc symbol wartości bezwzględnej
a) |x-4|-3|x+3|-4|-2x+8| dla -3<x<4
-(x-4) - 3(x+3) +4(2x+8) =
= -x+4-3x-9+8x+32 =
= 4x + 27