Răspuns:
Explicație pas cu pas:
3
Aabd=Aade=Aadc=Aabc/3 (au aceeasi baza di inatime comuna)
Aabe=Abac·2/3=30·2/3=20 cm² raspuns c)
4
Δ ABE este dreptunghic isoscel ∡BAE=45° ⇒AB=BE=3 cm
CE=BC-BE=5 m-3 m= 2m raspuns a)
5
Ambcd=(MD+BC)/DC/2=(8+4)·8/2=12·4=48 cm² raspuns : a)
6
V=Ab·h=40²·5=8000 cm³
SUB II
2
E(x)=(3+x-1)/(x-1)·(x-1)(x-2)/(x+2) x≠-2,1
a)x²-3x+2=x²-x-2x+2=x(x-1)-2(x-1)=(x-1)(x-2)
b)E(x)=(3+x-1)/(x-1)·(x-1)(x-2)/(x+2) =(x+2)(x-2)/(x+2)=x-2 x≠-2,1
1
a)
40·a/100=60b/100 4a=6b ⇒ a/3=b/2
a²-b²=3125 9b²/4-b²=3125 9b²-4b²=4·3125
5b²=4·3125 b²=625 b=25
a=3·b/2=3·25/2=
