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(2 11/15 - 1 19/30) * 0.4 - 0.57
0.43 + 0.3 * (1 5/12 - 9/20)
(11/35 - 4/21) : 3 7/15 + 3/5

(2 11/15 - 1 19/30) * 0,4 - 0,57 = - 0,131) 2 11/15 - 1 19/30 = 2 22/30 - 1 19/30 = 1 3/30 = 1 1/10 = 1,12) 1,1 * 0,4 = 0,443) 0,44 - 0,57 = - 0,130,43 + 0,3 * (1 5/12 - 9/20) = 0,721) 1 5/12 - 9/20 = 1 25/60 - 27/60 = 85/60 - 27/60 = 58/60 = 29/302) 0,3 * 29/30 = 3/10 * 29/30 = (1*29)/(10*10) = 29/100 = 0,293) 0,43 + 0,29 = 0,72(11/35 - 4/21) : 3 7/15 + 3/5 = 89/1401) 11/35 - 4/21 = 33/105 - 20/105 = 13/1052) 13/105 : 3 7/15 = 13/105 : 52/15 = 13/105 * 15/52 = (1*1)/(7*4) = 1/283) 1/28 + 3/5 = 5/140 + 84/140 = 89/140