Объяснение:
(7m-5n)²=49m²-70mn+25n²
(5k+2t)³=(5k)³+3*(5k)²*2t+3*5k*((2t)²+(2t)³=
=125k³+150k²t+60kt²+8t³
(3x-y)³=(3x)³-3*(3x)²y+3*3xy²-y³=
=27x³-27x²y+9xy²-y³
Объяснение:
(7m-5n)²=49m²-70mn+25n²
(5k+2t)³=(5k)³+3*(5k)²*2t+3*5k*((2t)²+(2t)³=
=125k³+150k²t+60kt²+8t³
(3x-y)³=(3x)³-3*(3x)²y+3*3xy²-y³=
=27x³-27x²y+9xy²-y³