(2,3+5,8)* 3 5/7 _______________ (4,9-2,3):7/9
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(2,3+5,8)* 3 5/7 _______________ (4,9-2,3):7/9 26/7*8,1 26*81/ 7 _________ = ________ = 9 2,6*9/7 26*9/7