RÄspuns :
1. 2x+3y=-5 / x2 4x+6y=-10 x=2
ā ā
3x-2y=12 / x3 9x-6y=36 y=-2
-----------------
13x/=26āx=2
2x+3y=-5ā4+3y=-5ā3y=-9āy=-3
2.Mg=āaxb (totul sub radical)
ā12=2ā3
Mg=ā(4-2ā3)x(4+2ā3)=ā(ā3-1)Ā²x(ā3+1)Ā²=3+ā3-ā3-1=2
4-2ā3=(ā3-1)Ā²
4+2ā3=(ā3+1)Ā²
3.a)f(ā2)=2ā2+1
f(ā2-1)=2ā2-2+1=2ā2-1
b)f(0)=1āA(0,1)
f(1)=3āB(1,3)
P.S. : Reprezintale tu pe grafic
c) f(x)=2x+1āa=2 si b=1
Gf ā© Ox= M(-b/a,0)=M(-1/2,0)
Gf ā© Oy=N(0,b)=N(0,1)
Reprezinta punctele si dupa aceia scie asa:
ĪBOA dreptunghic in O ā tgBOA=AO/BO=-1\2
AO=-1/2
BO=1
4.a) V=Abazei x h/ 3 = 144x8=1152cmĀ³
Abazei=lĀ²=12Ā²=144cmĀ²
b)Al=Pbazei x ap / 2= 48 x 10/ 2= 240cmĀ²
ap-apotema piramidei(VM)
Pbazei=4xl=48cm
Construim VBā„BC si OMā„BC, MāBC
OM=l/2=6cm
ĪVOM dreptunchic in O ā VMĀ²=VOĀ²+OMĀ²=64+36=100āVM=10cm
c) Nu stiu
ā ā
3x-2y=12 / x3 9x-6y=36 y=-2
-----------------
13x/=26āx=2
2x+3y=-5ā4+3y=-5ā3y=-9āy=-3
2.Mg=āaxb (totul sub radical)
ā12=2ā3
Mg=ā(4-2ā3)x(4+2ā3)=ā(ā3-1)Ā²x(ā3+1)Ā²=3+ā3-ā3-1=2
4-2ā3=(ā3-1)Ā²
4+2ā3=(ā3+1)Ā²
3.a)f(ā2)=2ā2+1
f(ā2-1)=2ā2-2+1=2ā2-1
b)f(0)=1āA(0,1)
f(1)=3āB(1,3)
P.S. : Reprezintale tu pe grafic
c) f(x)=2x+1āa=2 si b=1
Gf ā© Ox= M(-b/a,0)=M(-1/2,0)
Gf ā© Oy=N(0,b)=N(0,1)
Reprezinta punctele si dupa aceia scie asa:
ĪBOA dreptunghic in O ā tgBOA=AO/BO=-1\2
AO=-1/2
BO=1
4.a) V=Abazei x h/ 3 = 144x8=1152cmĀ³
Abazei=lĀ²=12Ā²=144cmĀ²
b)Al=Pbazei x ap / 2= 48 x 10/ 2= 240cmĀ²
ap-apotema piramidei(VM)
Pbazei=4xl=48cm
Construim VBā„BC si OMā„BC, MāBC
OM=l/2=6cm
ĪVOM dreptunchic in O ā VMĀ²=VOĀ²+OMĀ²=64+36=100āVM=10cm
c) Nu stiu
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