Oblicz.
a) 1/2 - 2/5 : ( 1 i 2/3 - 2 i 1/5)
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2/3 * 1 i 1/2 - 3/4
b) (2/3 * 2,7 - 7/15 : 1/3) : 1/25 * (3/4 - 1/6)
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8/15 + 0,3
c)(1/5 + 1,3) :3/2 - (18 i 3/4 - 4,95) : 2 i 3/10
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1 i 1/5 : 0,6 - 2 i 2/5 * 1,25
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