帮忙做3道英文数学题
问题描述：
帮忙做3道英文数学题
1.Find the equation of straight line passes through the midpoint of the interval joining (6,2) and (-2,4).and the orgin.
2.the midpoint of an interval is (2.4). If the coordinates at the ends of the interval are (m,5) and (8,n). find m and n.
3.A and B are the points (-3,4) and (6,-2) respectively . If M is the midpoint of AB.Find the distance BM.
帮我做下这3个英文题吧...
答
1.the midpoint of the interval joining (6,2) and (-2,4)is (2,3)so if the line is y=kx3=2kso k=1.5the equation of the straight line is y=1.5x2.so we can get m+8=2*25+n=4*2thusm=-4n=33.if M is the midpo...