Ve hinh 22 vao vo roi tim diem z tren duong thang d1 va diem T tren duong thang d2 sao cho X,Z,T thang hang va Y,Z,T thang hang
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25 tháng 11 2016
Số đường thẳng là:
\(\frac{4.\left(4-1\right)}{2}=6\left(đt\right)\)
17 tháng 8 2018
3 diem thang hang tao thanh 1 duong thang goc.
diem D nam ngoai duoc thang
nen lay diem D lam mut de ve cac duong thang di qua 2 trong 4 diem co 3 diem nen co 3 duong thang.
cho minh nhe
19 tháng 11 2017
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