已知x＋y=6，xy=4，则x²＋y²=
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喂，把心还给我
2025-03-27 00:11:16
x+y=6 xy=4
x^2+y^2
=(x+y)^2-2xy
=x^2+y^2
=(x+y)^2-2xy
=6^2-2*4
=36-8
=28
节操嘎嘣脆
2025-03-27 02:02:48
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2025-03-27 00:11:16
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