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b= ( 2 2/9 - 4 1/3) ÷ 3 1/6= ( 2 2/9 - 4 3/9) ÷ 19/6 = -2 1/9 ÷ 19/6= -19/9 x 6/19 = - 2/3
a < b
b= ( 2 2/9 - 4 1/3): 3 1/6= (20/9 - 13/3): 3 1/6= (20/9- 39/9): 3 1/6= - 19/9: 3 1/6= -19/9: 19/6= -19/9*6/19= -2/3
a<b
wydaje mi się, że jest dobrze:)