If: x+y=5, xy=6
calculate below:
A). x^2 + y^2
B). x^4 + y^4
請列計算方法.
F.2 Maths: Identity
2009-10-05 2:27 am
回答 (3)
2009-10-06 1:46 am
✔ 最佳答案
F.2 Maths: IdentityIf: x+y=5, xy=6
calculate below:
A). x^2 + y^2
B). x^4 + y^4
請列計算方法.
A)x²+y²=5²
x²+y²=25
B)x^4+y^4=5^4
x^4+y^4=625
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2009-10-05 2:44 am
點解
x^2+y^2 會等如 (x+y)^2-2xy??
x^2+y^2 會等如 (x+y)^2-2xy??
2009-10-05 2:36 am
x2+y2
=(x+y)2-2xy
=52-2(6)
=25-12
=13
x4+y4
=(x2+y2)2-2x2y2
=(13)2-2(6)2
=169-72
=97
=(x+y)2-2xy
=52-2(6)
=25-12
=13
x4+y4
=(x2+y2)2-2x2y2
=(13)2-2(6)2
=169-72
=97
收錄日期: 2021-04-23 20:38:45
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