1/3 + 2/7 : 1 - 1/9 + 3/7 =
1/3+2/7 :1 - 1/9+3/7= 7/21+6/21:1-7/63+27/63=13/21 + 40/63=819/1323+840/1323=1659/1320= 1 339/1320
nie wiem czy dobrze ale raczej tak
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1/3+2/7 :1 - 1/9+3/7= 7/21+6/21:1-7/63+27/63=13/21 + 40/63=819/1323+840/1323=1659/1320= 1 339/1320
nie wiem czy dobrze ale raczej tak