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vuduyen482003
2 năm trước
Giải hộ mik đc ko?!!!!!!!!! >.....< Chứng minh rằng: ($a^{2}$ + $b^{2}$ )($x^{2}$ + $y^{2}$) = (ay-bx)$^{2}$ + (ax+by)$^{2}$
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