Contact us
Choose a category below so we can get back to you as quickly as possible.
cos=cos45°=√2/2;∴cos=a·b/|a|×|b|=(-2+2N)/√(1+4)√(4+N²;)=√2/2;∴3N²;-16N-12=0;(3N+2)(N-6)=0;∴N=-2/3;或6;∴b=(-2,-2/3)或(-2,6)如果本題有什麼不明白可以追問,如果滿意記得採納如果有其他問…
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.