Contact us
Choose a category below so we can get back to you as quickly as possible.
由題意: x=-y 所以: 5x-(-8x)=13 13x=13 x=1 所以: y=-1 即:解是1和-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.