(1):若;2/(x^2-x+1)=1/x,求x^2/(x^4-1)的值.(2):y=√17-x,xy=3,求x^3+y^3的值 两题求解,过程. 11 分钟
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![(1):若;2/(x^2-x+1)=1/x,求x^2/(x^4-1)的值.(2):y=√17-x,xy=3,求x^3+y^3的值 两题求解,过程. 11 分钟](/uploads/image/z/13357874-2-4.jpg?t=%281%29%3A%E8%8B%A5%3B2%2F%28x%5E2-x%2B1%29%3D1%2Fx%2C%E6%B1%82x%5E2%2F%28x%5E4-1%29%E7%9A%84%E5%80%BC.%282%29%3Ay%3D%E2%88%9A17%EF%BC%8Dx%2Cxy%3D3%2C%E6%B1%82x%5E3%2By%5E3%E7%9A%84%E5%80%BC+%E4%B8%A4%E9%A2%98%E6%B1%82%E8%A7%A3%2C%E8%BF%87%E7%A8%8B.+11+%E5%88%86%E9%92%9F)
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(1):若;2/(x^2-x+1)=1/x,求x^2/(x^4-1)的值.(2):y=√17-x,xy=3,求x^3+y^3的值 两题求解,过程. 11 分钟
(1):若;2/(x^2-x+1)=1/x,求x^2/(x^4-1)的值.(2):y=√17-x,xy=3,求x^3+y^3的值 两题求解,过程. 11 分钟
(1):若;2/(x^2-x+1)=1/x,求x^2/(x^4-1)的值.(2):y=√17-x,xy=3,求x^3+y^3的值 两题求解,过程. 11 分钟
(1):若;2/(x^2-x+1)=1/x
2x/(x²-x+1)=1
2/(x-1+1/x)=1
x-1+1/x=2
x+1/x=3
x²+2+1/x²=9
x²+1/x²=7
(x-1/x)²=5
x-1/x=±√5
所以
x²/(x^4-1)
=1/(x²-1/x²)
=1/(x+1/x)(x-1/x)
=± 1/(3√5)=±√5/15
(2) x³+y³=(x+y)³-3xy(x+y)
=(√17)³-3√17*3
=17√17-9√17
=8√17
若x^3+y^3+1=19,x^2y-xy^2=-30, x^3+y^3=18 xy^2-x^2y=30 题目应是 代数式(x^3-y^3)+(3xy^2-x^2y)-2(x^2y-y^3) =x^3
x/x-2+x-9/x-7=x+1/x-1+x-8/x-6,
x/x-2+x-9/x-7=x+1/x-1+x-8/x-6,
x/x平方-x+2=2x/x+1
(X+1)X(X+2)X(X+3)=504
*-----------------------------------------------*| 6 4 X | 8 X X | X X 5 || X X X | X X X | X 7 8 || X X X | X X X | X X X ||---------------+---------------+--------------- || X X X | X X X | 5 1 X || X X X | X 6 X | X X X || 8 X X | 3 5 X | 2 X X ||
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x(x-2)-2x(x+1)-3x(x-5) 其中x=负½
(x-3/x-2)-(x-2/x-1)=(x-5/x4) -(x-4/x-3)
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如果X*X--1=0,那么X*X*X+2*X*X+2008=几?