1.x+y=4,x²-y²=20,则x-y=多少?2.已知x+y=3,xy=2,求x²+y²的值1.x+y=4,x²-y²=20,则x-y=多少?2.已知x+y=3,xy=2,求x²+y²的值3.已知x-y=5,x²+y²=15,求xy的值4.已知(a+b)²=17,ab=3.求(
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![1.x+y=4,x²-y²=20,则x-y=多少?2.已知x+y=3,xy=2,求x²+y²的值1.x+y=4,x²-y²=20,则x-y=多少?2.已知x+y=3,xy=2,求x²+y²的值3.已知x-y=5,x²+y²=15,求xy的值4.已知(a+b)²=17,ab=3.求(](/uploads/image/z/8634644-44-4.jpg?t=1.x%2By%3D4%2Cx%26%23178%3B-y%26%23178%3B%3D20%2C%E5%88%99x-y%3D%E5%A4%9A%E5%B0%91%3F2.%E5%B7%B2%E7%9F%A5x%2By%3D3%2Cxy%3D2%2C%E6%B1%82x%26%23178%3B%2By%26%23178%3B%E7%9A%84%E5%80%BC1.x%2By%3D4%2Cx%26%23178%3B-y%26%23178%3B%3D20%2C%E5%88%99x-y%3D%E5%A4%9A%E5%B0%91%3F2.%E5%B7%B2%E7%9F%A5x%2By%3D3%2Cxy%3D2%2C%E6%B1%82x%26%23178%3B%2By%26%23178%3B%E7%9A%84%E5%80%BC3.%E5%B7%B2%E7%9F%A5x-y%3D5%2Cx%26%23178%3B%2By%26%23178%3B%3D15%2C%E6%B1%82xy%E7%9A%84%E5%80%BC4.%E5%B7%B2%E7%9F%A5%EF%BC%88a%2Bb%EF%BC%89%26%23178%3B%3D17%2Cab%3D3.%E6%B1%82%EF%BC%88)
1.x+y=4,x²-y²=20,则x-y=多少?2.已知x+y=3,xy=2,求x²+y²的值1.x+y=4,x²-y²=20,则x-y=多少?2.已知x+y=3,xy=2,求x²+y²的值3.已知x-y=5,x²+y²=15,求xy的值4.已知(a+b)²=17,ab=3.求(
1.x+y=4,x²-y²=20,则x-y=多少?2.已知x+y=3,xy=2,求x²+y²的值
1.x+y=4,x²-y²=20,则x-y=多少?
2.已知x+y=3,xy=2,求x²+y²的值
3.已知x-y=5,x²+y²=15,求xy的值
4.已知(a+b)²=17,ab=3.求(a-b)²的值
1.x+y=4,x²-y²=20,则x-y=多少?2.已知x+y=3,xy=2,求x²+y²的值1.x+y=4,x²-y²=20,则x-y=多少?2.已知x+y=3,xy=2,求x²+y²的值3.已知x-y=5,x²+y²=15,求xy的值4.已知(a+b)²=17,ab=3.求(
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