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( 3/8 + 1/8 ) * 5 = 4/8 * 5 = 20/8 = 2 i 4/8 = 2,5
0,75 : 3/4 + 2 + 3/4 : 3/4 + 2 = 3/4 * 4/3 + 2 = 2 bo trzy czwarte i cztery czwarte się skrócą
( 3 do kwadratu - 8 ) * 0,5 = 0,5
0,75 * 1/2 : 2 = 1