=с²-4 =49-х²
=144-х² =25а²-64в²
=9х²-у² =4-64м²
=36х²-81 =169с²-196д²
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=с²-4 =49-х²
=144-х² =25а²-64в²
=9х²-у² =4-64м²
=36х²-81 =169с²-196д²