Разложить на множители разность квадратов 1/49x^2−4/25y^2
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(1/49x−4/25y)⋅(1/49x+4/25y)
1/49x^2−2⋅1/7x⋅2/5y+4/25y^2
(1/7x−2/5y)⋅(1/7x+2/5y)
1/49x^2−4/35xy+4/25y^2
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