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hehfhf
@hehfhf
September 2021
1
5
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1.Упростите выражение
(-8x+5y)в квадрате- -16x(-8x-5y)
2.Упростите выражение
y(7y+4x)-(2x+y) в квадрате
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Answers & Comments
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1.
(-8x+5y)²-16x(-8x-5y) = (5y-8x)²+128x²+80xy = 25y²-80xy+64x²+128x²+80xy =
25y²+192x².
2.
y(7y+4x)-(2x+y)² = 7y²+4xy-4x²-4xy-y² =
6y²-4x².
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Answers & Comments
(-8x+5y)²-16x(-8x-5y) = (5y-8x)²+128x²+80xy = 25y²-80xy+64x²+128x²+80xy =
25y²+192x².
2.
y(7y+4x)-(2x+y)² = 7y²+4xy-4x²-4xy-y² = 6y²-4x².