早教吧作业答案频道 -->数学-->
(a2-3a+2除以1)+(a2-5a+6除以1)+(a2-7a+12除以1)=
题目详情
(a2-3a+2除以1)+(a2-5a+6除以1)+(a2-7a+12除以1)=
▼优质解答
答案和解析
(a2-3a+2除以1)+(a2-5a+6除以1)+(a2-7a+12除以1)
= (1/(a2-3a+2))+(1/(a2-5a+6))+(1/(a2-7a+12))
= 1/(a-2)(a-1)+1/(a-2)(a-3)+1/(a-3)(a-4)
=((a-4)(a-3)+(a-1)(a-4)+(a-1)(a-2))/((a-1)(a-2)(a-3)(a-4))
=(3a*a-15a+18)/((a-1)(a-2)(a-3)(a-4))
=(3*(a-2)(a-3))/((a-1)(a-2)(a-3)(a-4))
=3/((a-1)(a-4))
= (1/(a2-3a+2))+(1/(a2-5a+6))+(1/(a2-7a+12))
= 1/(a-2)(a-1)+1/(a-2)(a-3)+1/(a-3)(a-4)
=((a-4)(a-3)+(a-1)(a-4)+(a-1)(a-2))/((a-1)(a-2)(a-3)(a-4))
=(3a*a-15a+18)/((a-1)(a-2)(a-3)(a-4))
=(3*(a-2)(a-3))/((a-1)(a-2)(a-3)(a-4))
=3/((a-1)(a-4))
看了 (a2-3a+2除以1)+(...的网友还看了以下:
1.求数列1,x+x^2,x^2+x^3+x^4,x^3+x^4+x^5+x^6,...前n项之和2 2020-03-30 …
设向量组a1=(3,1,2,0),a2=(-1,2,0,1),a3=(6,9,4,3),求其一个最 2020-05-17 …
求解向量的线性表示问题证明:b=(-1,1,5)是向量a1=(1,2,3),a2=(0,1,4), 2020-06-14 …
Mathematica怎么画不出d[3.3]的图?程序如下:Table[{M = Solve[(x 2020-06-27 …
已知向量线a1=(1,2,3),a2=(3,-1,2),a3=(2,3,c),求(1)c为何值时, 2020-07-09 …
设A(a1,a2,a3...)为是实矩阵,证明|Det(A)|小于等于a1列各元素平方和的1/2乘 2020-08-03 …
a1=1/2,a1+a2+...+an=n^2an数学归纳法数列{An}满足A1=1/2,A1+A 2020-08-03 …
数列{an}满足a1=1/2,a1+a2+a3+...+an=n的平方(an)1.求a2,a3,a4 2020-10-31 …
小明在解决问题:已知a=12+3,求2a2-8a+1的值,他是这样分析与解答的:∵a=12+3=2- 2020-10-31 …
差后等比的通项公式怎么求啊,例如a2-a1=1/2,a3-a2=1/6,a4-a3=1/12···· 2020-10-31 …