Сократите дроби 10х9 /30Х9
14Х15 / 21Х20
Х -умножение
10х9 /30Х9
90/270= 1/3
210/420=1/2
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10х9 /30Х9
90/270= 1/3
14Х15 / 21Х20
210/420=1/2