1, A = 5x - 3y / 2x+ y , Biet 2 . x = y
2 , B = ( x5 + y 5 - x ^2 . y ^ 2) ( x+y) - 2020 Biet x + y = 0
4 , D = ( x ^ 5 + y ^ 6 - 2 ) . ( 2y- 4 tai x = 50 y , y - 2 = 0
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Sinh Học lớp 12
