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50/7 * 7/100 - 45/8 * 16/10 =
1/1 * 1/2 - 9/1 * 2/2 =
1/2 - 9 * 1 =
1/2 - 9 = 1/2 - 8 2/2 = -8 1/2
b) -2,34 * 3 11/13 + 1,26 * 5 5/9 =
-234/100 * 50/13 + 126/100 * 50/9 =
-18/2 * 1/1 + 14/2 * 1/1 =
-18/2 + 14/2 = - 9 + 7 = - 2