(5а³-4b)²+(5а³+4b)²=
=25a⁶-2*5*4a³b+16b² + 25a⁶+2*5*4a³b+16b² =
=25a⁶+16b² + 25a⁶+16b² =
=50a⁶+32b²
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(5а³-4b)²+(5а³+4b)²=
=25a⁶-2*5*4a³b+16b² + 25a⁶+2*5*4a³b+16b² =
=25a⁶+16b² + 25a⁶+16b² =
=50a⁶+32b²