1十3十5十7十9十11十、、、、、、十99=()=()x()
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
2x十8十3x十8十4x十8=?请算出这道题目求士寸佰了⑥
4X十3(X十1)=31
(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
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?
(x十1)(x十3)等于6x十4,解这个方程
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)=
4(X十3)=6x
2十3十4十5十6十100十9999十222=
1十1十1十2十3十4十5十9
1十2十3十4十5十6十7十8十9十10x5=几