已知(x+y)²=49,(x-y)²=1,求下列各式的值 ⑴x²+y² ⑵xy已知(x+y)²=49,(x-y)²=1,求下列各式的值 ⑴x²+y² ⑵xy
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![已知(x+y)²=49,(x-y)²=1,求下列各式的值 ⑴x²+y² ⑵xy已知(x+y)²=49,(x-y)²=1,求下列各式的值 ⑴x²+y² ⑵xy](/uploads/image/z/1661300-44-0.jpg?t=%E5%B7%B2%E7%9F%A5%28x%2By%29%26%23178%3B%3D49%2C%28x-y%29%26%23178%3B%3D1%2C%E6%B1%82%E4%B8%8B%E5%88%97%E5%90%84%E5%BC%8F%E7%9A%84%E5%80%BC+%E2%91%B4x%26%23178%3B%2By%26%23178%3B+%E2%91%B5xy%E5%B7%B2%E7%9F%A5%28x%2By%29%26%23178%3B%3D49%2C%28x-y%29%26%23178%3B%3D1%2C%E6%B1%82%E4%B8%8B%E5%88%97%E5%90%84%E5%BC%8F%E7%9A%84%E5%80%BC+%E2%91%B4x%26%23178%3B%2By%26%23178%3B+%E2%91%B5xy)
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已知(x+y)²=49,(x-y)²=1,求下列各式的值 ⑴x²+y² ⑵xy已知(x+y)²=49,(x-y)²=1,求下列各式的值 ⑴x²+y² ⑵xy
已知(x+y)²=49,(x-y)²=1,求下列各式的值 ⑴x²+y² ⑵xy
已知(x+y)²=49,(x-y)²=1,求下列各式的值 ⑴x²+y² ⑵xy
已知(x+y)²=49,(x-y)²=1,求下列各式的值 ⑴x²+y² ⑵xy已知(x+y)²=49,(x-y)²=1,求下列各式的值 ⑴x²+y² ⑵xy
x^2+2xy+y^2=49(1)
x^2-2xy+y^2=1(2)
(1)+(2)
2(x^2+y^2)=50
x^2+y^2=25
2xy=24
xy=12