A²-36/5a²-30a дробь при а=7,5 ответ=0,36 y(7y-4x)-(2x-y)² при х=√28 у=√10 ответ=-52
a²-16b²/a² дробь÷ab-4b²/a дробь при а=75 при в=15 ответ=0,12
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