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a)
4,67-( 3 5/6 - 1/3) = 4 67/100 - ( 23/6 - 1/3) = 467/100 - ( 23/6 - 2/6) = 467/100 - 21/6 = 2802/600 - 4200/600= - 4 200/600 = 4 2/6 - zkresl zera
b)
2,8+1 1/3*0,9 = 2 8/10 + 4/3 * 9/10 = 28/10+12/10=40/10 = 4
/ - to jest kreska ulamkowa
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