Trên tia Ax,lấy 2 điểm B và M sao cho AB=6cm,AM=3cm
a,Điểm M có nằm giữa A và B ko?Vì sao
b,M là trung điểm AB ko?Vì sao?
cảm ng giải rất nhiềuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuu
a) Điểm M nằm giữa A và B vì:
AB = 6 cm
AM = 3cm
=> AM = AB : 2
= 6 : 2 = 3 cm
M nằm giữa A và B và cách đều 2 đầu là 3cm
b) MA = MB, M trung điểm AB vì:
M nằm giữa A và B
MB = AB - MA
MB = 6 - 3 = 3 cm
=> MA = MB = 3cm