x^+2xy+y^+4=16 x^-2xy+y^=16 求(3xy+6y^)+|x^-(2xy+2y^-3x^)|的值
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x^+2xy+y^+4=16 x^-2xy+y^=16 求(3xy+6y^)+|x^-(2xy+2y^-3x^)|的值
x^+2xy+y^+4=16 x^-2xy+y^=16 求(3xy+6y^)+|x^-(2xy+2y^-3x^)|的值
x^+2xy+y^+4=16 x^-2xy+y^=16 求(3xy+6y^)+|x^-(2xy+2y^-3x^)|的值
x^+2xy+y^+4=16 (x+y)²=16-4=12 (1)
x^-2xy+y^=16 (x-y)²=16 (2)
(1)-(2) 2y*2x=-4 xy=-1
(3xy+6y^)+|x^-(2xy+2y^-3x^)|
=3xy+6y²+|x²-2xy-2y²+3x²| 变成以下(3) (4)两个式子
=3xy+6y²+x²-2xy-2y²+3x² (3)
=3xy+6y²-x²+2xy+2y²-3x² (4)
(3)=3xy+6y²+x²-2xy-2y²+3x²=4x²+xy+4y²=4(x+y)²-7xy=4*12-7*(-1)=55
(4)=3xy+6y²-x²+2xy+2y²-3x²=-4x²+5xy+8y²=-4(x-y)²-3xy +12y²
=-4*16-3*(-1)+12*(7+4√3)=23+48√3
(3xy+6y^)+|x^-(2xy+2y^-3x^)|的值是55 或 23+48√3
x^+2xy+y^+4=16 x^-2xy+y^=16 求(3xy+6y^)+|x^-(2xy+2y^-3x^)|的值
(-3x^y+2xy)-( )=4x^+xy
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(12x^2y-8xy^2+16xy)/-3x+2y-4=?
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2x^+xy-y^-4x+5y-6=?
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求(3x^+y^-5xy)-【2x^-(-4xy-y^+7x^)】=?
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(x^-4y^)/(x^+2xy+y^)/(x+2y)/(2x^+2xy)
因式分解 x-xy+3y-3x 2x+xy-y-4x+5y-6