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2014-06-04T14:13:29+03:00
a) +2-(+3-7+5-10)-(-5+3)=2-(8-17)-(-2)= \\ =2-(-9)+2=2+9+2=13 \\ b)/-1/-/-2/+/-3/-/-4/+/-5/=1-2+3-4+5= \\ =9-6=3 \\ c)2 ^{170} :(-8) ^{56} +(-2)^{2 ^{1} } +(-3)^{1^{2}} +(-1)^{3^{4^{5}}}= \\ =2^{170}:(2^{3})^{56}+(-2)^{2}+(-3)^{1}+(-1)= \\ =2^{170}:2^{168}+4-3-1= \\ =2^{2}+1-1=4

Avem:
[CD este bisectoare, avem <ACD≡<ECD
DE inaltime ⇒ < CED=90* ⇒ <CAD≡<CED
CD latura comuna
din cazul UUL ⇒ ΔCAD≡ΔCED ⇒ AC≡CE ⇒ ΔACE isoscel

Notam cu <ACB=x si cu M intersectia  AF cu BC
In ΔCAD avem <CDA=90-<ACD=90-x/2 ⇒ <FDA=90-x/2
In ΔFMC avem <MFC=90-<FCM=90-x/2
Dar <CFM=<AFD - opuse la varf ⇒ <AFD=90-x/2
Deci <AFD=<FDA=90-x/2 ⇒ ΔAFD isoscel