Toán Lớp 8: 12. Cho x+y=a, xy=b. Tính theo a,b
a, $x^{4}$ +$y^{4}$
b, $x^{5}$ +$y^{5}$
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Toán Lớp 8: 12. Cho x+y=a, xy=b. Tính theo a,b
a, $x^{4}$ +$y^{4}$
b, $x^{5}$ +$y^{5}$
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