Question

!.triunghi ABC cu AB =12 cm, BC=18 cm AE 4cm ,AD mediana .Calculati a)EC=2AE?b) Perimetriul triunghiului ABC.
2.Calculati 1+3+3-5:2+1-6-2-2:2-10:5=
3.Aflati valoarea lui x din
20000-3x=100-19-1500=2500
4.Daca a+c=620 si a+d=415 Calculati a+b+c si a-b=d
5.Rezolvati ecuatiile
a.2x+3=x+15
B.3(2x+1)=4x+9
^ Daca triunghiule ABCsiADC echilaterale atunci triunghiurile ABCsi BDC

b.

Answer 1

1+3+3-5:2+1-6-2-2:2-10:5=
4+3-2,5+1-6-2-1-2=5,5-11=-5,5

3)  20000-3x=100-19-1500=2500
20000-3x=81-1500-2500
-3x=81-4000-20000
-3x=81-24000
-3x=-23919    inmultim -1
x=23919/3
x=7973

5.a)2x+3=x+15
2x-x=15-3
x=12

b.3(2x+1)=4x+9
6x+3=4x+9
6x-4x=9-3
2x=6
x=6/2
x=3