a)10^-1+2^-1+4^-1=1/10+1/2+1/4= 2/20+10/20+5/20=17/20
a) AD= inaltime BC=4 atunci DC=BD= 4cm/2= 2cm
b)Aria ABC= Baza x inaltimea supra 2
aria ABC=4x6/2=24/2=12 cm patrati
c)Aria ABD=2x6/2=12/2=6cm patrati
3)a)5c+5lei=6 c-3 lei
6c-5c=5-3 lei
1c=8 lei
b)5x8+5=6x8-3
45 lei=45 lei
4)a) nu stiu
b)1/6/x+1-1/1/x+1/2/2=0
x+1/6-x/1+2/2=0
x+1-6x+3=0ori 6
-5x+4=0
-5x=-4
x=4/5
4)