一道数学的函数题求解答.(题目是英文的)The polynomial f(x)=mx^3-5x^2-nx+4,where m and n are constants,leaves a remainder of R when it is divided by(x-1) and a remainder of 2R-28 when it is divided by (x-2).Show that 5m=2n+7

来源:学生作业帮助网 编辑:作业帮 时间:2024/11/25 07:13:29
一道数学的函数题求解答.(题目是英文的)The polynomial f(x)=mx^3-5x^2-nx+4,where m and n are constants,leaves a remainder of R when it is divided by(x-1) and a remainder of 2R-28 when it is divided by (x-2).Show that 5m=2n+7
xNQ_e.u>Z@BmiS?^4 ]ڇWBջ^5 9f~g`*;mn~W _{~l߾q\8X]N>n5_4fYFO 0)D0;F R*Kϯ3,WY>'.hꢖ MW,@ t9HI- sˑͣz:CPDSju2arjΈؾ)xvz}y^;s}5-*esD(G9o-ARVy,4ć4(I lUM(b ݄^/Z`HfV \U0t t2NX]OY3rVQAJЭW/넎I`_F2:0ADerD,zY@I *鹑 ]^LWd| vx3-[Cj_ϗ9Ef|wٹa:ZM^V.6D>!MeB[ܲm O!XY'H!CizcjB ͆HGAb CLQ]I0aLmԮ-^ ց{}o\w m|T̽*gϖǽ@.x.i?7E:'

一道数学的函数题求解答.(题目是英文的)The polynomial f(x)=mx^3-5x^2-nx+4,where m and n are constants,leaves a remainder of R when it is divided by(x-1) and a remainder of 2R-28 when it is divided by (x-2).Show that 5m=2n+7
一道数学的函数题求解答.(题目是英文的)
The polynomial f(x)=mx^3-5x^2-nx+4,where m and n are constants,leaves a remainder of R when it is divided by(x-1) and a remainder of 2R-28 when it is divided by (x-2).
Show that 5m=2n+7

一道数学的函数题求解答.(题目是英文的)The polynomial f(x)=mx^3-5x^2-nx+4,where m and n are constants,leaves a remainder of R when it is divided by(x-1) and a remainder of 2R-28 when it is divided by (x-2).Show that 5m=2n+7
多项式 f(x)=mx^3-5x^2-nx+4 ,其中m、n为常数.
当它被 x-1 除时余数为r,当它被x-2除时余数为2r-28,
求证:5m=2n+7.
证明:因为 f(x) 被 x-1 除的余数为 r ,所以 f(x)=(x-1)*p(x)+r ,令 x=1 则 f(1)=r ,
即 m-5-n+4=r ; (1)
同理 f(2)=2r-28,即 8m-20-2n+4=2r-28 ; (2)
2*(1)-(2)得 (2m-10-2n+8)-(8m-20-2n+4)=28,
即 2m-10-2n+8-8m+20+2n-4=28,
合并得 -6m=14 ,
解得 m=-7/3 .
(又仔细检查了你的题目,发现你把条件弄错了.f(x) 被 x-2 除的余数为 28-2r ,而不是 2r-28.)
因为 f(1)=m-n-1=r,(1)
f(2)=8m-2n-16=28-2r ,(2)
所以 2*(1)+(2) 得 2m-2n-2+8m-2n-16=28,
合并得 10m=4n+38 ,
因此 5m=2n+19 .
(你的结论有误,请你仔细检查下题目.要不就是我翻译理解错了)