X十1十4/5X=1十7/8(X-1)十(X一1)怎么算
X十1十4/5X=1十7/8(X-1)十(X一1)怎么算
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
1十3十5十7十9十11十、、、、、、十99=()=()x()
(x十3)(x一3)十8>(x十5)(x一1)解不等式
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)=
5X十(X十1)=19怎么解,
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?
设(3x一1)^8=a8x^8十a7x^7十…a1x十ao 求(1) a8十a7十…十a1 (2) a8十a6十a4十a
1十2十3十4十5十6十7十8十9十10=
X.(X十1)x(X十2)x(x十3) =360
4X十3(X十1)=31
7(x十4)=2(2一x)十3(4x一2) 6(2x一7)=5(x十8)十9 5(1十2x)=3(x一2)十3(17一x