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Jasmin1408
@Jasmin1408
August 2022
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Помогите пожалуйста❤️❤️❤️Не поняла тему вообще❤️❤️
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oganesbagoyan
Verified answer
2)
(4x -y)² -(4x+y)² ? x=1 1/8 =( 1*8+1/)8 =19/8 b=-0,2.
(4x -y)² -(4x+y)² =(4x-y-(4x+y))(4x-y+4x+y) = -2y*8x = -16xy=-16*9/8*(-0,2) =
=18*0,2 =3,6.
или
(4x -y)² -(4x+y)² =(4x)² -2*(4x)*y +y²) -(16x² +8xy+y²) =16x² -8xy+y²-16x² -8xy-y²=
-16xy
3)
( 2x-5)² - 2(7x-1)² =((2x)² -2*2x*5 +5²) - 2((7x)² -2*7x*1 +1²)=
4x² -20x+25 -2(49x² -14x ²+1)= 4x² -20x +25 -98x²+28x -2 =-94x²+8x+23.
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Verified answer
2) (4x -y)² -(4x+y)² ? x=1 1/8 =( 1*8+1/)8 =19/8 b=-0,2.(4x -y)² -(4x+y)² =(4x-y-(4x+y))(4x-y+4x+y) = -2y*8x = -16xy=-16*9/8*(-0,2) =
=18*0,2 =3,6.
или
(4x -y)² -(4x+y)² =(4x)² -2*(4x)*y +y²) -(16x² +8xy+y²) =16x² -8xy+y²-16x² -8xy-y²=
-16xy
3)( 2x-5)² - 2(7x-1)² =((2x)² -2*2x*5 +5²) - 2((7x)² -2*7x*1 +1²)=
4x² -20x+25 -2(49x² -14x ²+1)= 4x² -20x +25 -98x²+28x -2 =-94x²+8x+23.