Ответ:
а)(2t-9)(4t+1)=8t²+2t-36t-9=8t²-34t-9
b)x²+xd-8x-xd-d²+8d=x²-d²-8x+8d
B)2m²n²+5m³-6n³-15mn
G)f⁶+5f⁴+25f²-5f⁴-25f²-125=f⁶-125
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Ответ:
а)(2t-9)(4t+1)=8t²+2t-36t-9=8t²-34t-9
b)x²+xd-8x-xd-d²+8d=x²-d²-8x+8d
B)2m²n²+5m³-6n³-15mn
G)f⁶+5f⁴+25f²-5f⁴-25f²-125=f⁶-125