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nastyakslv
@nastyakslv
July 2022
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Разложите на множители, используя формулы сокращённого умножения:
1) (m²-4n)²-(m²-2n²)=?
2) (x-2y)²+4(x-2y)+4
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2407Alexa
1) (m²-4n)²-(m²-2n)²= (m²-4n-m²+2n)(m²-4n+m²-2n)=-2n(2m²-6n)=12n²-4m²n.
a²-b²=(a-b)(a+b)
a=(m²-4n)²
b=(m²-2n)²
2) (x-2y)²+4(x-2y)+4=x²-4xy+4y²+4x-8y+4
(a-b)²=a²-2×a×b+b²
a=x
b=2y
(x-2y)²+4(x-2y)+4=((x-2y)+2)²
a²+2×a×b+b²=(a+b)²
a=(x-2y)
b²=4=>√b²=√4=>b=2
3) (m²-4n)²-(m²-2n²)=(m²)²-2×m²×4n+(4n)²-m²+2n²=m⁴-8m²n+16n²-m²+2n²=m⁴-m²-8m²n+18n²
(a-b)²=a²-2×a×b+b²
a=m²
b=4n
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Answers & Comments
a²-b²=(a-b)(a+b)
a=(m²-4n)²
b=(m²-2n)²
2) (x-2y)²+4(x-2y)+4=x²-4xy+4y²+4x-8y+4
(a-b)²=a²-2×a×b+b²
a=x
b=2y
(x-2y)²+4(x-2y)+4=((x-2y)+2)²
a²+2×a×b+b²=(a+b)²
a=(x-2y)
b²=4=>√b²=√4=>b=2
3) (m²-4n)²-(m²-2n²)=(m²)²-2×m²×4n+(4n)²-m²+2n²=m⁴-8m²n+16n²-m²+2n²=m⁴-m²-8m²n+18n²
(a-b)²=a²-2×a×b+b²
a=m²
b=4n