а) 27,9 / 0,09 = 279 * 100 / 9 = 31 * 100 = 310
б) 100% = 1
220% = 2,2
11 / 2,2 = 5
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а) 27,9 / 0,09 = 279 * 100 / 9 = 31 * 100 = 310
б) 100% = 1
220% = 2,2
11 / 2,2 = 5