ppts.net
当前位置:首页>>关于已知关于x,y的多项式6mx2-8nxy+3x-4xy-x2+y-3中不...的资料>>

已知关于x,y的多项式6mx2-8nxy+3x-4xy-x2+y-3中不...

6mx²—8nxy+3x—4xy—x²+y—3 =(6m-1)x²-(8n+4)xy+3x+y-3 由于不含二次项 所以6m-1=0,8n+4=0即m=1/6,n=-1/2; 所以3m-4n=3x1/6-1x(-1/2)=1

∵6mx²-8nxy+3x-4xy-x²+y-3 =(6m-1)x²+(-8n-4)xy+3x+y-3 要使此多项式不含二次项, 则 6m-1=0,-8n-4=0 ∴m=1/6,n=-½ ∴3m-4n=3×(1/6)-4×(-½) =½+2 =5/2

网站首页 | 网站地图
All rights reserved Powered by www.ppts.net
copyright ©right 2010-2021。
内容来自网络,如有侵犯请联系客服。zhit325@qq.com