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a) ta có 20*19:2=.... (tự tính)
b) ta có 20*19:2-5*4/2=.......(tự tính)
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1/ đúng
2/ đúng
3/sai thiếu điều kiện M,A,B thẳng hàng
khi nối 3 điểm nầy lại với nhau thì vễ kiểu j cũng ra hình tam giác
Ta có: nếu AB là cạnh huyền thì
BC+CA>AB với mọi số đo
mà:AB=BC+CA=\(\dfrac{1}{3}+\dfrac{1}{6}=\dfrac{1}{2}\)=>A,B.C thẳng hàng
vì trong 1 đoạn thẳng có 1 điểm nằm giữa thì 2 cạnh trong đoạn thẳng đóluôn luôn công lại = cả đoạn
MK CHỈ BIẾT VẬY THUI.O PÍT CÓ ĐÚNG O.NẾU SAI THÌ ĐỪNG CÓ NÉM ĐÁ NHA
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