(3/4-3/16)X(2/9十1/3)?
(x十1)(x十3)等于6x十4,解这个方程
1十1十1十2十3十4十5十9
1十2十3十4十5十6十7十8十9十10二?
1十2十3十4十5十6十7十8十9十10=
1/(x^2一4x十3)十1/(x^2一8x十15)十1/(x^2-12x十35)十1/(x^2一16x十63)=
(1)(X一3)(X一2)十18=(X十9)(X十1) (2)(3X十4)(3X一4)<9(X一2
已知1十x十x^2 十x^3=0,求x十x^2十x^3十x^4+x^5十x^6+x^7十x^8的值
1十2十3十4十5十6十7十8十9十10.98十99十100等于?
1十2十3十4十5+6+7十8十9十10十10000O
x+1/x=3,求(x^4十x^2十1)分之(x^2)
1234567654321x(1十2十3十4十5十6十7十6十5十4十3十2十1)等于多少?
(1十3十5十7十211)一(2十4十6十十210)怎么算