Contact us
Choose a category below so we can get back to you as quickly as possible.
a*-2+b*4=16①b*1+a*7=19解得a=2 b=5 原方程2x+5y=16①5x+2y=19② 解得:x=3,y=2
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.