Contact us
Choose a category below so we can get back to you as quickly as possible.
(1)×5+(2)×4得 21x-7z=0 ∴z=3x 把z=3x代入(1)得 x+4y-9x=0 ∴y=2x 把y=2x,z=3x代入原式得 原式=(6x-15x)/(2x-2x+9x)=-9x/9x=-1
We and our partners use cookies and other technologies to analyze traffic and optimize your experience. View more info and control your cookies settings at any time in our Cookies Policy.