已知a-2b=5,则a^2-2ab-10b=?若a+b=3,则ab+(a^2+b^2)/2=?若4x^2+4xy+2y^
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已知a-2b=5,则a^2-2ab-10b=?若a+b=3,则ab+(a^2+b^2)/2=?若4x^2+4xy+2y^2+6y+9=0,则x-y=?
![已知a-2b=5,则a^2-2ab-10b=?若a+b=3,则ab+(a^2+b^2)/2=?若4x^2+4xy+2y^](/uploads/image/z/17262240-24-0.jpg?t=%E5%B7%B2%E7%9F%A5a-2b%3D5%2C%E5%88%99a%5E2-2ab-10b%3D%3F%E8%8B%A5a%2Bb%3D3%2C%E5%88%99ab%2B%28a%5E2%2Bb%5E2%29%2F2%3D%3F%E8%8B%A54x%5E2%2B4xy%2B2y%5E)
1:a²-2ab-10b=a(a-2b)-10b
=5a-10b
=5(a-2b)
=5×5
=25
2:ab+(a²+b²)/2=(a+b)²/2=3²/2=9/2.
3:4x²+4xy+2y²+6y+9=0
(4x²+4x+y²)+(y²+6y+9)=0
(2x+y)²+(y+3)²=0
y+3=0,y=-3
2x+y=0,x=3/2
x-y=3/2+3=9/2.
=5a-10b
=5(a-2b)
=5×5
=25
2:ab+(a²+b²)/2=(a+b)²/2=3²/2=9/2.
3:4x²+4xy+2y²+6y+9=0
(4x²+4x+y²)+(y²+6y+9)=0
(2x+y)²+(y+3)²=0
y+3=0,y=-3
2x+y=0,x=3/2
x-y=3/2+3=9/2.
若a/b=2 则a*a-ab+b*b/a*a+b*b等于?
3a-3b/10ab*25a^b3/a^-b^= x^-4y^/x^+2xy+y^/x+2y/2x^+2xy
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