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10 tháng 8 2019

có ai hong giúp mink với

22 tháng 3 2019

AMN bé hơn ABN

AMN bé hơn ABC

23 tháng 3 2019

lam bai giai ra ho ban nha😚😚😚😚😚

21 tháng 2 2018

a) s=(14+14)/2

S=14 m2

b) S(MICA)= 28m2

c) S(MICK)=73.5m2

4 tháng 4 2016

CO AI KO GIUP ZOI

11 tháng 3 2017

A B M C

a) M điểm giữa của BC nên CM = MB

Tam giác ABM và tam giác ACM có : đáy CM = MB, chung đường cao tương ứng với đáy.

Nên S(ABM) = S(ACM)

b) S(ABC) = S(ABM) + S(ACM) mà S(ABM) = S(ACM)

Nên  \(S\left(ABM\right)=\frac{1}{2}S\left(ABC\right)\)

13 tháng 3 2017

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