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____________ =(3 ¼-½)/[2¹₃-⅔+3,5*2,25]=(2 5/4-2/4)/[1 4/3-⅔+7,875]=
2¹₃-2×¹₃+3.5×2¼
(2 3/4)/[1 2/3+7 7/8]=11/4 /[1 16/24+7 21/24]=11/4 /[8 37/24]=
11/4 /[229/24]=11/4 *24/229=66/229