2000x^3=2001y^3=2002z^3xyz>0______________________ ______ _____ ____3/ =3/ 3/ 3/\/ 2000x^2+2001y^2+2002z^2 \/ 2000 + \/ 2001 \/ 2002求 1/x+1/y+1/z 的值Note:此为三次根号______3/\/
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y=x+2000 3x-y=1000x
(x+y-5)*(x+y-5)+(x-y+3)=0 x*x-y*y
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推倒公式:(x+y)(x*x-3x+y*y)=x*x*x+y*y*y怎么做.
谁来帮我做二元一次方程组?{2001x--2002y=2003{2000x--2001y=2001{x=3y--2{y=2x--y{2x=3y--1{4y=2x+1{3x--13y=--12{x+3y=2{2x--5y+13=0{9x+6y--8=0
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