x-2y=5 xy=-2.x²+4y²=?(x+2y)²=?x²-3x-6x+6=-2 则2x²-6x+6=?x-2y=5 xy=-2。x²+4y²=?(x+2y)²=?x²-3x-6=-2 则2x²-6x+6=?
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![x-2y=5 xy=-2.x²+4y²=?(x+2y)²=?x²-3x-6x+6=-2 则2x²-6x+6=?x-2y=5 xy=-2。x²+4y²=?(x+2y)²=?x²-3x-6=-2 则2x²-6x+6=?](/uploads/image/z/567891-27-1.jpg?t=x-2y%3D5+xy%3D-2.x%26%23178%3B%2B4y%26%23178%3B%3D%3F%28x%2B2y%29%26%23178%3B%3D%3Fx%26%23178%3B-3x-6x%2B6%3D-2+%E5%88%992x%26%23178%3B-6x%2B6%3D%3Fx-2y%3D5+xy%3D-2%E3%80%82x%26%23178%3B%2B4y%26%23178%3B%3D%3F%28x%2B2y%29%26%23178%3B%3D%3Fx%26%23178%3B-3x-6%3D-2+%E5%88%992x%26%23178%3B-6x%2B6%3D%EF%BC%9F)
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x-2y=5 xy=-2.x²+4y²=?(x+2y)²=?x²-3x-6x+6=-2 则2x²-6x+6=?x-2y=5 xy=-2。x²+4y²=?(x+2y)²=?x²-3x-6=-2 则2x²-6x+6=?
x-2y=5 xy=-2.x²+4y²=?(x+2y)²=?x²-3x-6x+6=-2 则2x²-6x+6=?
x-2y=5 xy=-2。x²+4y²=?(x+2y)²=?x²-3x-6=-2 则2x²-6x+6=?
x-2y=5 xy=-2.x²+4y²=?(x+2y)²=?x²-3x-6x+6=-2 则2x²-6x+6=?x-2y=5 xy=-2。x²+4y²=?(x+2y)²=?x²-3x-6=-2 则2x²-6x+6=?
(x-2y)^2
=x^2+4y^2-4xy
25=x^2+4y^2+8
x^2+4y^2=17
(x+2y)^2
=x^2+4xy+4y^2
=17-8
=9
后面一题请检查下